67/100IFR Score
Ranked #1 because of its Google rating and service focus: 5.0★ from 497 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
Best Managed IT Service Providers in Fullerton, CA (2026)
869 managed IT service providers ranked by IFR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Fullerton: Sam's IT Solutions, IFR Score 67/100; 5.0★ from 497 Google reviews; open 7 days a week.
- 2
Most-reviewed: Annansys, 713 Google reviews at 4.9★, the most of 869 ranked; ranked #2.
Rankings can't be bought. IT providers can't pay to change their rank or score. How we rank
869 Fullerton managed IT service providers are ranked here by IFR Score, from nine published factors. 360 open Saturdays and 226 open Sundays, based on posted hours. The median Google rating is 5.0★ across 869 rated IT firms.
Top 10 managed IT service providers in Fullerton at a glance
Ranked by IFR Score from public data. Sponsored placements are labelled and never change the order.
| Rank | Business | IFR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Sam's IT Solutions | 67 | 5.0★ (497) | Pasadena, 23 mi away | Sat · Sun · Evenings | Overall |
| 2 | Annansys | 67 | 4.9★ (713) | Chino Hills, 15 mi away | — | Most reviews |
| 3 | QuickMountTV™ - Your Trusted TV Mounting & Smart Home Experts! | 65 | 5.0★ (144) | Laguna Beach, 16 mi away | Sat · Sun · Evenings | — |
| 4 | Forum Info-Tech | 65 | 5.0★ (173) | Corona, 20 mi away | Sat · Sun · Evenings | — |
| 5 | Tech Expert Guys | 65 | 4.9★ (241) | Irvine, 14 mi away | Sat · Sun | — |
| 6 | GenCare Managed IT Services Los Angeles | 64 | 5.0★ (174) | Glendale, 29 mi away | Sat · Sun · Evenings | — |
| 7 | Intelecis Cyber Security Company Irvine | 64 | 5.0★ (87) | Irvine, 15 mi away | Sat · Sun · Evenings | — |
| 8 | Burgi Technologies | Managed IT & Cybersecurity | 64 | 5.0★ (75) | Tustin, 13 mi away | Sat · Sun · Evenings | — |
| 9 | CAL IT Group - Managed IT Services | 63 | 5.0★ (69) | Huntington Beach, 15 mi away | Sat · Sun · Evenings | — |
| 10 | IronOrbit | 63 | 4.8★ (47) | Anaheim, 7 mi away | Sat · Sun · Evenings | — |
The 869 best managed IT service providers in Fullerton, ranked
Ordered by IFR Score, a 0–100 score from nine published factors. Paid placement never changes the order.
Ranked by IFR Score from public data. Sponsored placements are labelled and never change the order.
#2 Annansys
Based in Chino Hills, 15 mi away
67/100IFR ScoreRanked #2 because of its Google rating and service focus: 4.9★ from 713 Google reviews, listed on Google as “Computer support and services”.
Based on 7 of 9 factors; recency and availability not yet collected.
Based in Laguna Beach, 16 mi away
65/100IFR ScoreRanked #3 because of its Google rating and service focus: 5.0★ from 144 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
Based in Corona, 20 mi away
65/100IFR ScoreRanked #4 because of its Google rating and service focus: 5.0★ from 173 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
Based in Irvine, 14 mi away
65/100IFR ScoreRanked #5 because of its Google rating and service focus: 4.9★ from 241 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
Based in Glendale, 29 mi away
64/100IFR ScoreRanked #6 because of its Google rating and service focus: 5.0★ from 174 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
Based in Irvine, 15 mi away
64/100IFR ScoreRanked #7 because of its Google rating and service focus: 5.0★ from 87 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
Based in Tustin, 13 mi away
64/100IFR ScoreRanked #8 because of its Google rating and service focus: 5.0★ from 75 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
Based in Huntington Beach, 15 mi away
63/100IFR ScoreRanked #9 because of its Google rating and service focus: 5.0★ from 69 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
#10 IronOrbit
Based in Anaheim, 7 mi away
63/100IFR ScoreRanked #10 because of its Google rating and service focus: 4.8★ from 47 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
Based in Baldwin Park, 15 mi away
63/100IFR ScoreRanked #11 because of its Google rating and service focus: 5.0★ from 51 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
#12 Support.com
Based in Pasadena, 23 mi away
63/100IFR ScoreRanked #12 because of its Google rating and service focus: 4.9★ from 85 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
#13 Technijian
Based in Irvine, 19 mi away
62/100IFR ScoreRanked #13 because of its Google rating and service focus: 4.7★ from 87 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
Based in Los Angeles, 33 mi away
62/100IFR ScoreRanked #14 because of its Google rating and service focus: 5.0★ from 87 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
Based in Irvine, 13 mi away
62/100IFR ScoreRanked #15 because of its Google rating and service focus: 5.0★ from 35 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
#16 It Can Be Fixed
Based in Lynwood, 15 mi away
62/100IFR ScoreRanked #16 because of its Google rating and service focus: 4.2★ from 319 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
#17 Hailo
Based in Santa Monica, 33 mi away
62/100IFR ScoreRanked #17 because of its Google rating and service focus: 4.7★ from 125 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
Based in Long Beach, 16 mi away
62/100IFR ScoreRanked #18 because of its Google rating and service focus: 4.9★ from 39 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
#19 IT Support LA
Based in Calabasas, 48 mi away
61/100IFR ScoreRanked #19 because of its Google rating and service focus: 5.0★ from 130 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
Based in Redondo Beach, 27 mi away
61/100IFR ScoreRanked #20 because of its Google rating and service focus: 4.9★ from 56 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
#21 Tech Guardian
Based in Lake Elsinore, 36 mi away
61/100IFR ScoreRanked #21 because of its Google rating and service focus: 4.9★ from 87 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
Based in Los Angeles, 33 mi away
61/100IFR ScoreRanked #22 because of its Google rating and service focus: 5.0★ from 63 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
Based in Irvine, 14 mi away
61/100IFR ScoreRanked #23 because of its Google rating and service focus: 5.0★ from 45 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
#24 No Problem Mac
Based in Los Angeles, 30 mi away
61/100IFR ScoreRanked #24 because of its Google rating and service focus: 5.0★ from 93 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
Based in Irvine, 13 mi away
61/100IFR ScoreRanked #25 because of its Google rating and review volume: 5.0★ from 174 Google reviews.
Based on 8 of 9 factors; recency not yet collected.
Managed IT service providers ranked #26 to #50
#1 to #25 are shown in full above. Here are #26 to #50, in IFR Score order; each links to its profile. We publish the top 50 of 869 ranked managed IT service providers here; the rest are on their profiles.
Also serving Fullerton
20 more managed IT service providers within 50 mi that we can't rank yet: too few reviews, or a service we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| Action Computer Technologies | 5.0★ (2) | In Fullerton |
| Acutech Network Services | 3.0★ (2) | 5 mi |
| Advance IT | In Fullerton | |
| Cloud Based Phone Systems Fullerton | In Fullerton | |
| Conx360 IT Services | In Fullerton | |
| Creative One Solutions LLC | 5.0★ (2) | 1 mi |
| DRP Sec LLC | 5.0★ (1) | In Fullerton |
| e-Mayhem LLC | 5.0★ (2) | 4 mi |
| Envisiontech | 1.0★ (1) | In Fullerton |
| FAST I.T. Solution | 4.7★ (3) | In Fullerton |
| Fullerton Computer Repair | In Fullerton | |
| Get IT Done LLC | 5.0★ (1) | In Fullerton |
| Larson IT Management | 5.0★ (2) | 5 mi |
| Mit Systems Inc | 1.0★ (1) | In Fullerton |
| Quest Digital Solutions Inc. | 4.0★ (7) | In Fullerton |
| Tanner & Tanner, Inc. | In Fullerton | |
| tech smart corp | 2.0★ (4) | In Fullerton |
| TechWise Group | 3.0★ (2) | 3 mi |
| TNP Cyber | In Fullerton | |
| Trimble Inc. | In Fullerton |
How we ranked Fullerton managed IT service providers
We scored 869 Fullerton managed IT service providers on nine factors, weighted as shown. An IT firm is ranked when its service is confirmed and it has 3 or more Google reviews or a claimed profile. An IT firm with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed November 9, 2026.
Paid placement never changes a rank or score. Sponsored businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Fullerton data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Review volume | 15% | Number of Google reviews, compared with the most-reviewed IT firm on the list | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday and 24/7 support | Measured |
| Service focus | 15% | How clearly the firm does this service (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The firm has claimed its IT Firms Ranked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The firm links to IT Firms Ranked from its own website with our badge, checked periodically | Measured |
| Client reviews | 10% | Verified client reviews collected by IT Firms Ranked: their rating and how many there are | Measured |
How to choose a managed IT service provider
- Ask for a sample service-level agreement and compare response times, support hours and exclusions.
- Check how backups are done and tested, and ask when they last restored a client’s data.
- Ask which security tools are included and which cost extra (MFA, endpoint protection, email filtering, staff training).
- Make sure you, not the firm, own your accounts, domain names and licences.
- Ask for two or three references from clients of your size and industry, and call them.
- Get the scope, response times and price in writing before you sign, including how you leave and get your data back.
Questions to ask a managed IT service provider
- Is the price per user, per device or a bundle, and what is not included?
- What are your response times for urgent, normal and low-priority tickets?
- Is your help desk in-house or outsourced, and what are its hours?
- How do you back up our data, how often do you test restores, and where are the copies kept?
- Which security tools are included, and do you monitor alerts after hours?
- What happens to our passwords, documentation and data if we leave?
- Can you give us references from clients of our size and industry?
Terms explained
- MSP (managed service provider)
- A firm that runs a business’s IT for a recurring fee: monitoring, patching, help desk, backups and security tools.
- Co-managed IT
- An arrangement where an outside firm supports an in-house IT person or team, sharing tools and tasks.
- Break-fix
- IT support paid per incident or per hour, with no monthly agreement.
- SLA (service-level agreement)
- The contract terms for response and resolution times, uptime and support hours.
- Help desk
- The support line staff call or email for IT problems.
- RMM
- Remote monitoring and management software that lets an IT firm watch, patch and fix computers remotely.
- vCIO
- A virtual chief information officer: part-time IT strategy and budgeting from an outside firm.
- MSSP
- A managed security service provider: a firm that monitors and manages security tools around the clock.
- EDR / MDR
- Endpoint detection and response software, and the managed service of people watching its alerts (managed detection and response).
- MFA
- Multi-factor authentication: a second proof of identity, such as an app prompt, on top of a password.
- Penetration test
- An authorised, simulated attack on your systems to find weaknesses before criminals do.
- SOC 2
- An independent auditor’s report (AICPA standard) on a service provider’s security controls.
Managed IT service providers in Fullerton: frequently asked questions
Who is the best managed IT service provider in Fullerton?
By IFR Score, the highest-ranked managed IT service provider in Fullerton, CA is Sam's IT Solutions with an IFR Score of 67/100. It has 5.0★ from 497 Google reviews. It is open 7 days a week. Annansys (#2) and QuickMountTV™ - Your Trusted TV Mounting & Smart Home Experts! (#3) follow. We ranked 869 managed IT service providers on nine factors, last updated November 9, 2026.
How many managed IT service providers are there in Fullerton?
ITFirmsRanked ranks 869 managed IT service providers serving Fullerton, CA. Another 20 within 50 mi are listed but not ranked yet. Counts are as of November 2026.
Which managed IT service providers in Fullerton work on weekends?
360 of 869 ranked managed IT service providers post Saturday hours and 226 post Sunday hours. The highest-ranked open Saturdays are Sam's IT Solutions (#1), QuickMountTV™ - Your Trusted TV Mounting & Smart Home Experts! (#3) and Forum Info-Tech (#4). Posted hours are office hours; many firms also run an after-hours support line for contract clients.
What Google rating do Fullerton managed IT service providers have?
The median Google rating among 869 rated managed IT service providers in Fullerton is 5.0★, with a median of 13 reviews. Annansys has the most, 713 reviews, and ranks #2. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ITFirmsRanked rank managed IT service providers?
Each managed IT service provider gets a 0–100 IFR Score from nine published factors, led by reputation (25%), review volume (15%), service focus (15%) and recency (10%). An IT firm with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only IT firms with a confirmed service and 3 or more reviews, or a claimed profile, are ranked.
Do managed IT service providers outside Fullerton count in this ranking?
Yes, if they are within 50 mi of the Fullerton city center, our service radius for managed IT service providers. Each listing shows where the IT firm is based and how far away it is. Proximity is 5% of the IFR Score, so a nearby IT firm gets a small edge.
Can managed IT service providers pay to rank higher on ITFirmsRanked?
No. The IFR Score never reads payment status, and this ranking has 0 paid placements. Up to 3 Featured IT firms may appear above the list, labelled Sponsored and showing their honest rank.
What does a managed IT service provider do?
Managed IT service providers (MSPs) run a business’s computers, servers, network, Microsoft 365 or Google accounts, backups and help desk for a monthly fee, or provide IT support by the hour.
How are managed it service providers in Fullerton ranked?
By IFR Score: Google rating and review volume, recent reviews, opening hours, how clearly the firm does managed IT services and IT support, distance, a claimed profile, our badge and verified client reviews. Sponsored placements never change the order.
What should a managed IT agreement include?
At minimum: help desk support for your staff, monitoring and patching of computers and servers, backups that are tested, security tools such as endpoint protection and multi-factor authentication, and a named contact. The agreement should state response times, support hours and what counts as out of scope.
Is managed IT priced per user or per device?
Both models are common, and some firms sell tiered bundles. Per-user pricing suits staff with several devices; per-device pricing suits shared computers. Compare quotes on the same number of users, devices and servers.
How long are managed IT contracts?
Often one to three years, sometimes month to month. Check the notice period, any early-termination fee and how the firm hands over passwords, documentation and data when the contract ends.
Update log for Fullerton
- November 2026: IFR Scores recalculated for 869 managed IT service providers serving Fullerton.
- November 2026: 5 duplicate listings merged.
More managed IT service providers and Fullerton pages
Managed IT service providers near Fullerton
- Managed IT service providers in Anaheim, CA879 ranked
- Managed IT service providers in Placentia, CA878 ranked
- Managed IT service providers in Brea, CA870 ranked
- Managed IT service providers in Buena Park, CA860 ranked
- Managed IT service providers in La Habra, CA873 ranked
- Managed IT service providers in La Mirada, CA881 ranked
- Managed IT service providers in Stanton, CA857 ranked
- Managed IT service providers in Yorba Linda, CA868 ranked
- Managed IT service providers in Garden Grove, CA866 ranked
- Managed IT service providers in Orange, CA842 ranked
Other services in Fullerton
- Cybersecurity companies in Fullerton529 ranked
- IT consultants in Fullerton656 ranked
- Network cabling and installation companies in Fullerton399 ranked
- Business phone system providers in Fullerton368 ranked
- Data recovery services in Fullerton421 ranked
- Computer repair shops in Fullerton431 ranked
- All IT providers in Fullerton