67/100IFR Score
Ranked #1 because of its Google rating and service focus: 4.9★ from 299 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Best Cybersecurity Companies in Foster City, CA (2026)
260 cybersecurity companies ranked by IFR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Foster City: People 1st IT Inc. LLC, IFR Score 67/100; 4.9★ from 299 Google reviews; open 7 days a week.
- 17
Most-reviewed: Central Computers, 698 Google reviews at 4.4★, the most of 260 ranked; ranked #17.
Rankings can't be bought. IT providers can't pay to change their rank or score. How we rank
260 Foster City cybersecurity companies are ranked here by IFR Score, from nine published factors. 81 open Saturdays and 63 open Sundays, based on posted hours. The median Google rating is 4.9★ across 260 rated IT firms.
Most of this list also appears on the Cybersecurity companies in San Jose ranking. See Cybersecurity companies in San Jose
Top 10 cybersecurity companies in Foster City 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 | People 1st IT Inc. LLC | 67 | 4.9★ (299) | San Francisco, 17 mi away | Sat · Sun | Overall |
| 2 | PC Professional Managed IT Services | 66 | 4.9★ (143) | Oakland, 17 mi away | Sat · Sun · Evenings | — |
| 3 | Proofpoint Inc | 62 | 4.2★ (96) | Sunnyvale, 17 mi away | Sat · Sun · Evenings | — |
| 4 | Palo Alto Networks Inc | 62 | 4.6★ (82) | Santa Clara, 20 mi away | Sat · Sun · Evenings | — |
| 5 | Blackhawk MSP Computer Support and Services | 61 | 4.9★ (46) | Danville, 22 mi away | Sat · Sun | — |
| 6 | TruAdvantage | 61 | 5.0★ (95) | San Francisco, 18 mi away | — | — |
| 7 | ArcSource Consulting | 60 | 4.9★ (19) | Albany, 23 mi away | Sat · Sun · Evenings | — |
| 8 | Zscaler | 59 | 3.8★ (38) | Santa Clara, 20 mi away | Sat · Sun · Evenings | — |
| 9 | Network Remedy - IT Support, IT Security & Managed IT Services | 59 | 5.0★ (78) | Santa Clara, 22 mi away | Sat · Sun · Evenings | — |
| 10 | Exabeam, Inc | 59 | 4.6★ (20) | Foster City | — | — |
The 260 best cybersecurity companies in Foster City, 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.
Based in Oakland, 17 mi away
66/100IFR ScoreRanked #2 because of its Google rating and service focus: 4.9★ from 143 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in Sunnyvale, 17 mi away
62/100IFR ScoreRanked #3 because of its Google rating and service focus: 4.2★ from 96 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in Santa Clara, 20 mi away
62/100IFR ScoreRanked #4 because of its Google rating and service focus: 4.6★ from 82 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in Danville, 22 mi away
61/100IFR ScoreRanked #5 because of its Google rating and service focus: 4.9★ from 46 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
#6 TruAdvantage
Based in San Francisco, 18 mi away
61/100IFR ScoreRanked #6 because of its Google rating and service focus: 5.0★ from 95 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in Albany, 23 mi away
60/100IFR ScoreRanked #7 because of its Google rating and service focus: 4.9★ from 19 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
#8 Zscaler
Based in Santa Clara, 20 mi away
59/100IFR ScoreRanked #8 because of its Google rating and service focus: 3.8★ from 38 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in Santa Clara, 22 mi away
59/100IFR ScoreRanked #9 because of its Google rating and service focus: 5.0★ from 78 Google reviews, listed on Google as “Computer support and services”.
Based on 8 of 9 factors; recency not yet collected.
#10 Exabeam, Inc
Based in Foster City
59/100IFR ScoreRanked #10 because of its Google rating and service focus: 4.6★ from 20 Google reviews, listed on Google as “Computer security service”.
Based on 7 of 9 factors; recency and availability not yet collected.
#11 SafeAeon Inc.
Based in Pleasanton, 22 mi away
59/100IFR ScoreRanked #11 because of its Google rating and service focus: 4.7★ from 14 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in San Mateo, 2 mi away
59/100IFR ScoreRanked #12 because of its Google rating and review volume: 4.6★ from 422 Google reviews.
Based on 8 of 9 factors; recency not yet collected.
Based in San Francisco, 18 mi away
59/100IFR ScoreRanked #13 because of its Google rating and service focus: 5.0★ from 23 Google reviews, listed on Google as “Computer security service”.
Based on 7 of 9 factors; recency and availability not yet collected.
#14 Pure Stack, Inc.
Based in Fremont, 18 mi away
58/100IFR ScoreRanked #14 because of its Google rating and service focus: 5.0★ from 24 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
#15 Big Dogs Tech
Based in Concord, 31 mi away
58/100IFR ScoreRanked #15 because of its Google rating and service focus: 4.6★ from 79 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
#16 TeamLogic IT
Based in Oakland, 17 mi away
58/100IFR ScoreRanked #16 because of its Google rating and service focus: 5.0★ from 33 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in Santa Clara, 23 mi away
57/100IFR ScoreRanked #17 because of its Google rating and review volume: 4.4★ from 698 Google reviews, the most in Foster City.
Based on 8 of 9 factors; recency not yet collected.
Based in Sunnyvale, 19 mi away
57/100IFR ScoreRanked #18 because of its Google rating and review volume: 4.5★ from 506 Google reviews.
Based on 8 of 9 factors; recency not yet collected.
Based in San Jose, 24 mi away
57/100IFR ScoreRanked #19 because of its Google rating and service focus: 5.0★ from 12 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in San Francisco, 17 mi away
57/100IFR ScoreRanked #20 because of its Google rating and review volume: 4.4★ from 564 Google reviews.
Based on 8 of 9 factors; recency not yet collected.
#21 Jones IT
Based in San Francisco, 17 mi away
57/100IFR ScoreRanked #21 because of its Google rating and review volume: 5.0★ from 431 Google reviews.
Based on 8 of 9 factors; recency not yet collected.
#22 Ignition IT
Based in San Francisco, 18 mi away
57/100IFR ScoreRanked #22 because of its Google rating and service focus: 5.0★ from 24 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
Based in San Francisco, 24 mi away
57/100IFR ScoreRanked #23 because of its Google rating and review volume: 5.0★ from 104 Google reviews.
Based on 8 of 9 factors; recency not yet collected.
Based in Redwood City, 2 mi away
57/100IFR ScoreRanked #24 because of its Google rating and service focus: 4.2★ from 26 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
#25 Cloudflare
Based in San Francisco, 17 mi away
57/100IFR ScoreRanked #25 because of its Google rating and service focus: 3.7★ from 146 Google reviews, listed on Google as “Computer security service”.
Based on 8 of 9 factors; recency not yet collected.
How we ranked Foster City cybersecurity companies
We scored 260 Foster City cybersecurity companies 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 Foster City 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 cybersecurity company
- Ask whether monitoring is staffed around the clock by the firm itself or by a partner.
- Ask for a sample assessment or penetration-test report with client details removed.
- Check experience with your industry’s rules (for example HIPAA, PCI DSS or CMMC).
- Ask what the firm does in the first hour of an incident, and whether that is in the contract.
- 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 cybersecurity company
- Is your security monitoring staffed 24/7, and by whom?
- Which frameworks do you assess against?
- What do your reports include, and do you re-test after we fix the findings?
- Do you handle incident response yourselves, and do you work with cyber insurers?
- What access will you need to our systems, and how is it controlled and logged?
- Which certifications do the people doing the work hold?
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.
Cybersecurity companies in Foster City: frequently asked questions
Who is the best cybersecurity company in Foster City?
By IFR Score, the highest-ranked cybersecurity company in Foster City, CA is People 1st IT Inc. LLC with an IFR Score of 67/100. It has 4.9★ from 299 Google reviews. It is open 7 days a week. PC Professional Managed IT Services (#2) and Proofpoint Inc (#3) follow. We ranked 260 cybersecurity companies on nine factors, last updated November 9, 2026.
How many cybersecurity companies are there in Foster City?
ITFirmsRanked ranks 260 cybersecurity companies serving Foster City, CA. 1 of them is based in Foster City; the rest serve it from nearby towns. Counts are as of November 2026.
Which cybersecurity companies in Foster City work on weekends?
81 of 260 ranked cybersecurity companies post Saturday hours and 63 post Sunday hours. The highest-ranked open Saturdays are People 1st IT Inc. LLC (#1), PC Professional Managed IT Services (#2) and Proofpoint Inc (#3). Posted hours are office hours; many firms also run an after-hours support line for contract clients.
What Google rating do Foster City cybersecurity companies have?
The median Google rating among 260 rated cybersecurity companies in Foster City is 4.9★, with a median of 15 reviews. Central Computers has the most, 698 reviews, and ranks #17. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ITFirmsRanked rank cybersecurity companies?
Each cybersecurity company 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 cybersecurity companies outside Foster City count in this ranking?
Yes, if they are within 75 mi of the Foster City city center, our service radius for cybersecurity companies. 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 cybersecurity companies 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 cybersecurity company do?
Cybersecurity companies assess and protect a business’s systems and data: security monitoring, endpoint protection, penetration testing, compliance support and incident response.
How are cybersecurity companies in Foster City ranked?
By IFR Score: Google rating and review volume, recent reviews, opening hours, how clearly the firm does cybersecurity, distance, a claimed profile, our badge and verified client reviews. Sponsored placements never change the order.
Do we need a cybersecurity firm if we already have an IT provider?
Sometimes. Many IT providers include basic security tools; a security firm adds specialist work such as 24/7 monitoring, penetration tests, compliance audits and incident response. Ask your IT provider what they cover and where they would bring in a specialist.
What is the difference between a security assessment and a penetration test?
An assessment reviews your policies, settings and controls against a framework. A penetration test is an authorised, simulated attack that tries to exploit weaknesses. Both end with a written report and a list of fixes.
Can a cybersecurity firm help with compliance?
Many help organisations prepare for requirements such as HIPAA, PCI DSS, CMMC or SOC 2. They can advise and assess, but only an independent auditor issues a SOC 2 report, and compliance is ultimately your responsibility.
Update log for Foster City
- November 2026: IFR Scores recalculated for 260 cybersecurity companies serving Foster City.
- November 2026: 1 duplicate listing merged.
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