67/100IFR Score
Ranked #1 because of its Google rating and review volume: 4.9★ from 1,090 Google reviews, the most in Castro Valley.
Best Computer Repair Shops in Castro Valley, CA (2026)
191 computer repair shops ranked by IFR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Castro Valley: Johnson Computer, Inc., IFR Score 67/100; 4.9★ from 1,090 Google reviews; open Saturdays until 4 PM.
- 4
Most-reviewed: COMPUTER WORLD - FREMONT BRANCH, 737 Google reviews at 4.3★, the most of 191 ranked after Johnson Computer, Inc.; ranked #4.
Rankings can't be bought. IT providers can't pay to change their rank or score. How we rank
191 Castro Valley computer repair shops are ranked here by IFR Score, from nine published factors. 109 open Saturdays and 62 open Sundays, based on posted hours. The median Google rating is 4.8★ across 191 rated IT firms.
Top 10 computer repair shops in Castro Valley 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 | Johnson Computer, Inc. | 67 | 4.9★ (1,090) | Hayward, 6 mi away | Sat · Evenings | Overall |
| 2 | Bay IC Repair | 64 | 4.7★ (135) | Castro Valley | Sat · Sun | — |
| 3 | Ken's Tech Repair | 63 | 4.7★ (156) | San Leandro, 4 mi away | Sat · Sun · Evenings | — |
| 4 | COMPUTER WORLD - FREMONT BRANCH | 63 | 4.3★ (737) | Fremont, 10 mi away | Sat · Sun · Evenings | Most reviews |
| 5 | Quickfix Wireless | 62 | 4.9★ (176) | Oakland, 14 mi away | Sat · Sun · Evenings | — |
| 6 | Techloop Electronics Repair and Sales ( iPhone, iPad, Mac, PC Repair and Sales) | 62 | 4.8★ (326) | Menlo Park, 18 mi away | Sat · Sun | — |
| 7 | CaliPhonia Phone, Computer Repair & Data Recovery | 62 | 4.8★ (227) | Walnut Creek, 14 mi away | Sat · Sun · Evenings | — |
| 8 | Central Computers | 62 | 4.6★ (422) | San Mateo, 16 mi away | Sat · Sun | — |
| 9 | ComputerLand of Berkeley | 61 | 4.7★ (453) | Berkeley, 16 mi away | Sat | — |
| 10 | Central Computers | 61 | 4.4★ (564) | San Francisco, 18 mi away | Sat · Sun | — |
The 191 best computer repair shops in Castro Valley, 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.
Scores below: based on 8 of 9 factors; recency not yet collected. Hatched segments mark factors we don't have yet.
Based in Castro Valley
64/100IFR ScoreRanked #2 because of its Google rating and service focus: 4.7★ from 135 Google reviews, listed on Google as “Computer repair service”.
Based in San Leandro, 4 mi away
63/100IFR ScoreRanked #3 because of its Google rating and service focus: 4.7★ from 156 Google reviews, listed on Google as “Computer repair service”.
Based in Fremont, 10 mi away
63/100IFR ScoreRanked #4 because of its Google rating and service focus: 4.3★ from 737 Google reviews, listed on Google as “Computer repair service”.
Based in Oakland, 14 mi away
62/100IFR ScoreRanked #5 because of its Google rating and service focus: 4.9★ from 176 Google reviews, listed on Google as “Computer repair service”.
Based in Menlo Park, 18 mi away
62/100IFR ScoreRanked #6 because of its Google rating and service focus: 4.8★ from 326 Google reviews, listed on Google as “Computer repair service”.
Based in Walnut Creek, 14 mi away
62/100IFR ScoreRanked #7 because of its Google rating and service focus: 4.8★ from 227 Google reviews, listed on Google as “Computer repair service”.
Based in San Mateo, 16 mi away
62/100IFR ScoreRanked #8 because of its Google rating and service focus: 4.6★ from 422 Google reviews, listed on Google as “Computer repair service”.
Based in Berkeley, 16 mi away
61/100IFR ScoreRanked #9 because of its Google rating and service focus: 4.7★ from 453 Google reviews, listed on Google as “Computer repair service”.
Based in San Francisco, 18 mi away
61/100IFR ScoreRanked #10 because of its Google rating and service focus: 4.4★ from 564 Google reviews, listed on Google as “Computer repair service”.
Based in Fremont, 10 mi away
61/100IFR ScoreRanked #11 because of its Google rating and service focus: 4.9★ from 70 Google reviews, listed on Google as “Computer service”.
Based in Berkeley, 16 mi away
61/100IFR ScoreRanked #12 because of its Google rating and service focus: 4.9★ from 252 Google reviews, listed on Google as “Computer repair service”.
Based in Concord, 18 mi away
60/100IFR ScoreRanked #13 because of its Google rating and service focus: 4.8★ from 177 Google reviews, listed on Google as “Computer repair service”.
#14 My Emergency Guy
Based in Oakland, 14 mi away
60/100IFR ScoreRanked #14 because of its Google rating and service focus: 4.6★ from 139 Google reviews, listed on Google as “Computer repair service”.
Based in San Francisco, 18 mi away
59/100IFR ScoreRanked #15 because of its Google rating and service focus: 4.7★ from 139 Google reviews, listed on Google as “Computer repair service”.
Based in Burlingame, 17 mi away
59/100IFR ScoreRanked #16 because of its Google rating and service focus: 4.9★ from 339 Google reviews, listed on Google as “Computer service”.
Based in Milpitas, 20 mi away
59/100IFR ScoreRanked #17 because of its Google rating and service focus: 4.9★ from 68 Google reviews, listed on Google as “Computer repair service”.
Based in Walnut Creek, 14 mi away
59/100IFR ScoreRanked #18 because of its Google rating and service focus: 4.8★ from 140 Google reviews, listed on Google as “Computer repair service”.
Based in Antelope, 12 mi away
59/100IFR ScoreRanked #19 because of its Google rating and service focus: 5.0★ from 40 Google reviews, listed on Google as “Computer repair service”.
Based in Pleasanton, 12 mi away
59/100IFR ScoreRanked #20 because of its Google rating and service focus: 4.7★ from 97 Google reviews, listed on Google as “Computer repair service”.
Based in Fremont, 15 mi away
59/100IFR ScoreRanked #21 because of its Google rating and service focus: 5.0★ from 50 Google reviews, listed on Google as “Computer repair service”.
#22 Y Y Computer
Based in Oakland, 12 mi away
59/100IFR ScoreRanked #22 because of its Google rating and service focus: 4.8★ from 93 Google reviews, listed on Google as “Computer repair service”.
Based in San Francisco, 19 mi away
58/100IFR ScoreRanked #23 because of its Google rating and service focus: 4.8★ from 164 Google reviews, listed on Google as “Computer repair service”.
Based in San Francisco, 19 mi away
58/100IFR ScoreRanked #24 because of its Google rating and service focus: 4.9★ from 282 Google reviews, listed on Google as “Computer repair service”.
#25 Bigfoot Repair
Based in Oakland, 9 mi away
58/100IFR ScoreRanked #25 because of its Google rating and service focus: 4.3★ from 122 Google reviews, listed on Google as “Computer repair service”.
Computer repair shops 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 191 ranked computer repair shops here; the rest are on their profiles.
Also serving Castro Valley
20 more computer repair shops within 20 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 |
|---|---|---|
| Adin Technologies | 3.0★ (2) | 9 mi |
| App Orchid Inc. | 5.0★ (2) | 9 mi |
| Ayar Labs | 5.0★ (2) | 15 mi |
| Cellpoint Systems | 5.0★ (2) | 15 mi |
| Certified Computech | 5.0★ (2) | 10 mi |
| Computer Tech Services | 5.0★ (1) | In Castro Valley |
| Cumula 3 Group | In Castro Valley | |
| DPL Computer Services | In Castro Valley | |
| Escalated Systems | 5.0★ (2) | 9 mi |
| IT Less Inc | 5.0★ (2) | 3 mi |
| ITkid | 5.0★ (2) | 9 mi |
| Lara Information Technology Services | In Castro Valley | |
| Lucky Designer & Lucky Merchant | 5.0★ (2) | 11 mi |
| Macrophage Security LLC | In Castro Valley | |
| MrPCBuilder | 5.0★ (2) | 13 mi |
| O'Sheas Computer Consultants | 4.5★ (2) | 15 mi |
| Ramiz Compu Services | In Castro Valley | |
| rhp soft | 3.0★ (2) | 9 mi |
| Tech Aid Plus | 5.0★ (2) | 14 mi |
| Techfinity | 5.0★ (2) | 15 mi |
How we ranked Castro Valley computer repair shops
We scored 191 Castro Valley computer repair shops 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 Castro Valley 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 computer repair shop
- Ask for a written estimate and approve any extra work before it is done.
- Ask whether they come on site and whether they work on business systems as well as home computers.
- Check the warranty on parts and labour.
- 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 computer repair shop
- Is the diagnosis free, and how much is the estimate likely to change?
- Do you back up our data before the repair?
- Do you offer on-site visits for businesses?
- What warranty do you give on parts and labour?
- How long will the repair take?
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.
Computer repair shops in Castro Valley: frequently asked questions
Who is the best computer repair shop in Castro Valley?
By IFR Score, the highest-ranked computer repair shop in Castro Valley, CA is Johnson Computer, Inc. with an IFR Score of 67/100. It has 4.9★ from 1,090 Google reviews. It is open Saturdays until 4 PM. Bay IC Repair (#2) and Ken's Tech Repair (#3) follow. We ranked 191 computer repair shops on nine factors, last updated November 9, 2026.
How many computer repair shops are there in Castro Valley?
ITFirmsRanked ranks 191 computer repair shops serving Castro Valley, CA. 3 of them are based in Castro Valley; the rest serve it from nearby towns. Another 20 within 20 mi are listed but not ranked yet. Counts are as of November 2026.
Which computer repair shops in Castro Valley work on weekends?
109 of 191 ranked computer repair shops post Saturday hours and 62 post Sunday hours. The highest-ranked open Saturdays are Johnson Computer, Inc. (#1), Bay IC Repair (#2) and Ken's Tech Repair (#3). Posted hours are office hours; many firms also run an after-hours support line for contract clients.
What Google rating do Castro Valley computer repair shops have?
The median Google rating among 191 rated computer repair shops in Castro Valley is 4.8★, with a median of 19 reviews. Johnson Computer, Inc. has the most, 1,090 reviews, and ranks #1. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ITFirmsRanked rank computer repair shops?
Each computer repair shop 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 computer repair shops outside Castro Valley count in this ranking?
Yes, if they are within 20 mi of the Castro Valley city center, our service radius for computer repair shops. 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 computer repair shops 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 computer repair shop do?
Computer repair shops fix desktops, laptops and printers in store or on site: hardware repairs, upgrades, virus removal and setup. Many serve small offices as well as households.
How are computer repair shops in Castro Valley ranked?
By IFR Score: Google rating and review volume, recent reviews, opening hours, how clearly the firm does computer repair, distance, a claimed profile, our badge and verified client reviews. Sponsored placements never change the order.
Should a business use a computer repair shop or an IT provider?
A repair shop suits one-off fixes on a few computers. Once you rely on shared files, email, backups and security across several staff, an IT provider with a support agreement usually works out better.
Should we back up before a repair?
Yes, if the computer still starts. Repairs can involve replacing drives or reinstalling the system. Ask the shop whether it backs up data first and what it charges.
Update log for Castro Valley
- November 2026: IFR Scores recalculated for 191 computer repair shops serving Castro Valley.
- November 2026: 1 duplicate listing merged.
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