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Best Managed IT Service Providers in St. Thomas, ON (2026)

67 managed IT service providers ranked by IFR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in St. Thomas: ACE I.T. Canada, IFR Score 63/100; 5.0★ from 70 Google reviews; open 7 days a week.

  2. 8

    Most-reviewed: Forest City Computers, 1,221 Google reviews at 4.8★, the most of 67 ranked; ranked #8.

Rankings can't be bought. IT providers can't pay to change their rank or score. How we rank

67 St. Thomas managed IT service providers are ranked here by IFR Score, from nine published factors. 27 open Saturdays and 12 open Sundays, based on posted hours. The median Google rating is 5.0★ across 67 rated IT firms.

Most of this list also appears on the Managed IT service providers in London ranking. See Managed IT service providers in London

Top 10 managed IT service providers in St. Thomas at a glance

Ranked by IFR Score from public data. Sponsored placements are labelled and never change the order.

Top 10 managed IT service providers in St. Thomas at a glance
RankBusinessIFR ScoreGoogle ratingBased inHoursBest for
1ACE I.T. Canada635.0★ (70)London, 26 km awaySat · Sun · EveningsOverall
2Ahsan Computers & Technologies615.0★ (43)London, 23 km awaySat · Sun · Evenings—
3ThirstyTech605.0★ (107)London, 23 km away——
4ManagePoint Technologies595.0★ (69)London, 24 km away——
5ScottB.ca - Scott Bruder594.8★ (20)London, 18 km awaySat · Sun—
6MC BUSINESS TECHNOLOGY CONSULTING GROUP INC.594.9★ (34)St. Thomas——
7RavenSoft Microsystems Inc.585.0★ (26)London, 26 km awaySat · Evenings—
8Forest City Computers584.8★ (1,221)London, 26 km awaySatMost reviews
9SECUREVU I.T.584.6★ (58)London, 17 km away——
10NHDTech575.0★ (10)St. ThomasSat · Evenings—

The 67 best managed IT service providers in St. Thomas, 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.

  1. Ranked #1 in St. Thomas

    #1 ACE I.T. Canada

    Based in London, 26 km away

    63/100IFR Score

    Ranked #1 because of its Google rating and service focus: 5.0★ from 70 Google reviews, listed on Google as “Computer support and services”.

    • 5.0★ from 70 Google reviews
    Hours
    Mon–Sun 12 AM–12 AM
    Address
    411 Industrial Rd Unit 6, London, ON N5V 3L3
    View profile for ACE I.T. Canada(519) 777-4791

  3. #3 ThirstyTech

    Based in London, 23 km away

    60/100IFR Score

    Ranked #3 because of its Google rating and service focus: 5.0★ from 107 Google reviews, listed on Google as “Computer support and services”.

    • 5.0★ from 107 Google reviews
    Hours
    Mon–Fri 9 AM–6 PM · Sat–Sun closed
    Address
    1738 Brunson Way, London, ON N6K 0H2
    View profile for ThirstyTech(226) 777-7045

  5. #5 ScottB.ca - Scott Bruder

    Based in London, 18 km away

    59/100IFR Score

    Ranked #5 because of its Google rating and service focus: 4.8★ from 20 Google reviews, listed on Google as “Computer support and services”.

    • 4.8★ from 20 Google reviews
    Hours
    Mon–Sun 9 AM–5 PM
    Address
    12 Kintail Crescent, London, ON N6E 1J5
    View profile for ScottB.ca - Scott Bruder

  7. #7 RavenSoft Microsystems Inc.

    Based in London, 26 km away

    58/100IFR Score

    Ranked #7 because of its Google rating and service focus: 5.0★ from 26 Google reviews, listed on Google as “Computer support and services”.

    • 5.0★ from 26 Google reviews
    Hours
    Mon–Thu 9:30 AM–6:30 PM · Fri 9:30 AM–5:30 PM · Sat 9 AM–1 PM · Sun closed
    Address
    892 Oakcrossing Rd, London, ON N6H 0A4
    View profile for RavenSoft Microsystems Inc.(647) 978-1976

  8. #8 Forest City Computers

    Based in London, 26 km away

    58/100IFR Score

    Ranked #8 because of its Google rating and review volume: 4.8★ from 1,221 Google reviews, the most in St. Thomas.

    • 4.8★ from 1,221 Google reviews
    Hours
    Mon–Fri 10 AM–6 PM · Sat 10 AM–5 PM · Sun closed
    Address
    991 Oxford St E, London, ON N5Y 3K6
    View profile for Forest City Computers(519) 670-1566

  9. #9 SECUREVU I.T.

    Based in London, 17 km away

    58/100IFR Score

    Ranked #9 because of its Google rating and service focus: 4.6★ from 58 Google reviews, listed on Google as “Computer support and services”.

    • 4.6★ from 58 Google reviews
    Hours
    Mon–Fri 9 AM–5 PM · Sat–Sun closed
    Address
    50 Shamrock Rd, London, ON N6E 0B6
    View profile for SECUREVU I.T.(855) 482-7301

  10. #10 NHDTech

    Based in St. Thomas

    57/100IFR Score

    Ranked #10 because of its Google rating and service focus: 5.0★ from 10 Google reviews, listed on Google as “Computer support and services”.

    • 5.0★ from 10 Google reviews
    Hours
    Mon–Fri 10 AM–6:30 PM · Sat 1 PM–5 PM · Sun closed
    Address
    Oxford Terrace, St. Thomas, ON N5R 0H7
    View profile for NHDTech(226) 577-7360

  12. #12 Attache Group Inc

    Based in London, 25 km away

    57/100IFR Score

    Ranked #12 because of its Google rating and service focus: 5.0★ from 33 Google reviews, listed on Google as “Computer support and services”.

    • 5.0★ from 33 Google reviews
    Hours
    Mon–Fri 8 AM–5:30 PM · Sat–Sun closed
    Address
    1108 Dundas St, London, ON N5W 3A7
    View profile for Attache Group Inc(519) 652-6898

  13. #13 Consys Group Inc.

    Based in London, 25 km away

    57/100IFR Score

    Ranked #13 because of its Google rating and service focus: 4.9★ from 35 Google reviews, listed on Google as “Computer support and services”.

    • 4.9★ from 35 Google reviews
    Hours
    Mon–Fri 8 AM–5 PM · Sat–Sun closed
    Address
    150 Kent St, London, ON N6A 1L3
    View profile for Consys Group Inc.(226) 973-9208

  15. #15 Geeks Worldwide Solutions

    Based in London, 28 km away

    57/100IFR Score

    Ranked #15 because of its Google rating and service focus: 4.6★ from 45 Google reviews, listed on Google as “Computer support and services”.

    • 4.6★ from 45 Google reviews
    Hours
    Mon–Fri 9 AM–5 PM · Sat–Sun closed
    Address
    Wyndham Gate, 1500 Richmond St Unit 8, London, ON N6G 4V1
    View profile for Geeks Worldwide Solutions(408) 416-3696

  16. #16 FixIT Tech Services

    Based in London, 24 km away

    56/100IFR Score

    Ranked #16 because of its Google rating and service focus: 5.0★ from 3 Google reviews, listed on Google as “Computer support and services”.

    • 5.0★ from 3 Google reviews
    Hours
    Mon–Sun 12 AM–12 AM
    Address
    240 Waterloo St Unit 105, London, ON N6B 2N4
    View profile for FixIT Tech Services(519) 953-4382

  18. #18 Reboot Repair

    Based in Stratford, 68 km away

    55/100IFR Score

    Ranked #18 because of its Google rating and service focus: 5.0★ from 31 Google reviews, listed on Google as “Computer support and services”.

    • 5.0★ from 31 Google reviews
    Hours
    Mon closed · Tue–Sat 10 AM–6 PM · Sun closed
    Address
    Unit 5, 155 Erie St, Stratford, ON N5A 2M6
    View profile for Reboot Repair(519) 271-7003

  19. #19 Asurtec Solutions

    Based in London, 27 km away

    55/100IFR Score

    Ranked #19 because of its Google rating and service focus: 4.0★ from 4 Google reviews, listed on Google as “Computer support and services”.

    • 4.0★ from 4 Google reviews
    Hours
    Mon–Fri 9 AM–9 PM · Sat–Sun 9 AM–5 PM
    Address
    557 Leyton Crescent, London, ON N6G 1S9
    View profile for Asurtec Solutions(289) 907-0553

  22. #22 Techdoz

    Based in London, 17 km away

    55/100IFR Score

    Ranked #22 because of its Google rating and service focus: 5.0★ from 9 Google reviews, listed on Google as “Computer support and services”.

    • 5.0★ from 9 Google reviews
    Hours
    Mon–Fri 9 AM–5 PM · Sat–Sun closed
    Address
    45 Meg Dr #106, London, ON N6E 2V2
    View profile for Techdoz(519) 203-9005

  23. #23 Smart Connect Pros

    Based in London, 24 km away

    55/100IFR Score

    Ranked #23 because of its Google rating and service focus: 5.0★ from 11 Google reviews, listed on Google as “Computer support and services”.

    • 5.0★ from 11 Google reviews
    Hours
    Mon–Fri 9 AM–5 PM · Sat–Sun closed
    Address
    201 King St, London, ON N6A 3M4
    View profile for Smart Connect Pros(226) 777-3082

  24. #24 WINJIVORA

    Based in London, 44 km away

    54/100IFR Score

    Ranked #24 because of its Google rating and service focus: 5.0★ from 9 Google reviews, listed on Google as “Computer support and services”.

    • 5.0★ from 9 Google reviews
    Hours
    Mon–Fri 8 AM–6 PM · Sat 9 AM–3 PM · Sun closed
    View profile for WINJIVORA(437) 245-8605

How we ranked St. Thomas managed IT service providers

We scored 67 St. Thomas 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.

Read the full method: formula, sources and exclusions

IFR Score factors and weights
FactorWeightComputed fromIn St. Thomas data
Reputation25%Google star rating, adjusted for how many reviews back itMeasured
Review volume15%Number of Google reviews, compared with the most-reviewed IT firm on the listMeasured
Recency10%Share of reviews from the last 12 monthsNot yet collected
Availability5%Weekly open hours, Saturday, Sunday and 24/7 supportMeasured
Service focus15%How clearly the firm does this service (its Google category and name)Measured
Proximity5%Based in the city scores highest, less the farther away it isMeasured
Claimed profile10%The firm has claimed its IT Firms Ranked profile (free or paid earn the same)Measured
Partnered5%The firm links to IT Firms Ranked from its own website with our badge, checked periodicallyMeasured
Client reviews10%Verified client reviews collected by IT Firms Ranked: their rating and how many there areMeasured

How to choose a managed IT service provider

  1. Ask for a sample service-level agreement and compare response times, support hours and exclusions.
  2. Check how backups are done and tested, and ask when they last restored a client’s data.
  3. Ask which security tools are included and which cost extra (MFA, endpoint protection, email filtering, staff training).
  4. Make sure you, not the firm, own your accounts, domain names and licences.
  5. Ask for two or three references from clients of your size and industry, and call them.
  6. 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 St. Thomas: frequently asked questions

Who is the best managed IT service provider in St. Thomas?

By IFR Score, the highest-ranked managed IT service provider in St. Thomas, ON is ACE I.T. Canada with an IFR Score of 63/100. It has 5.0★ from 70 Google reviews. It is open 7 days a week. Ahsan Computers & Technologies (#2) and ThirstyTech (#3) follow. We ranked 67 managed IT service providers on nine factors, last updated November 9, 2026.

How many managed IT service providers are there in St. Thomas?

ITFirmsRanked ranks 67 managed IT service providers serving St. Thomas, ON. 3 of them are based in St. Thomas; the rest serve it from nearby towns. Counts are as of November 2026.

Which managed IT service providers in St. Thomas work on weekends?

27 of 67 ranked managed IT service providers post Saturday hours and 12 post Sunday hours. The highest-ranked open Saturdays are ACE I.T. Canada (#1), Ahsan Computers & Technologies (#2) and ScottB.ca - Scott Bruder (#5). Posted hours are office hours; many firms also run an after-hours support line for contract clients.

What Google rating do St. Thomas managed IT service providers have?

The median Google rating among 67 rated managed IT service providers in St. Thomas is 5.0★, with a median of 11 reviews. Forest City Computers has the most, 1,221 reviews, and ranks #8. 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 St. Thomas count in this ranking?

Yes, if they are within 80 km of the St. Thomas city centre, 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 St. Thomas 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 St. Thomas

  1. November 2026: IFR Scores recalculated for 67 managed IT service providers serving St. Thomas.

More managed IT service providers and St. Thomas pages