Free calibration management software: know what's due before your auditor does.
Free for up to 25 instruments, with unlimited users, email reminders and no time limit. Here is what Free includes and when a paid plan is worth it.
Free for 25 instruments. Unlimited users. No card.
What the Free plan includes
25 instruments, unlimited users
Track up to 25 gages and instruments. Invite the technician, the inspector and the plant manager: there is no per-seat price on any plan.
No card to sign up, and Free has no time limit.
Reminders and the Monday due list
The same reminders as every paid plan: an email to each gage's custodian before it comes due, and the due list every Monday.
Certificate intake: 10 certificates a month
Upload the PDF your lab sends; CalibrationOS reads it and you confirm it. The count starts again on the first of each month (UTC).
Import, history and exports
Spreadsheet import, calibration history on each gage, a log of every change, and exports of the register (PDF or CSV) and the audit package (ZIP).
What Free covers
- 25 instruments, retired gages included
- Free holds 25 gages, counting every gage you add, including retired ones, which keep their history for the audit. An import that reaches 25 brings in rows up to the limit and lists the rows it held back. Starter takes 250.
- 10 certificates read a month
- The count starts again on the first of each month (UTC), and you can record any calibration by hand at any time. Starter reads 100 a month.
- One site
- Free and Starter cover one site. Professional covers 3.
- On the paid plans
- Drift analysis on Starter and up. Uncertainty budgets, Gage R&R, electronic signatures, the API and webhooks on Professional.
When to upgrade
- You pass 25 instruments
- Starter is $49 a month for 250 instruments and 100 certificates a month, with drift analysis.
- You need the regulated-lab tools or a second site
- Professional is $149 a month for 2,500 instruments and 3 sites, with unlimited certificate intake, uncertainty budgets, Gage R&R, electronic signatures and the API.
- Nothing is re-entered
- Upgrading keeps your gages, history and audit log as they are. Starter and Professional start with a 14-day trial.
Free plans compared
The free options buyers usually look at, side by side. Each vendor's figures come from its own pricing page on the date shown. Prices change, so check before you decide.
| Feature | CalibrationOS | GageList | Gaugelog | Gaugify | GagePilot |
|---|---|---|---|---|---|
| Free plan | Yes, no time limit | Yes | Yes, “not a trial” | Yes | No; 14-day trial |
| Instruments on the free plan | 25 | 25 gages | 30 | 30 assets | 500 during the trial |
| Users on the free plan | Unlimited | 5 | Unlimited | Unlimited | Unlimited |
| Card to sign up | No | Not stated | No | Not stated | No card for the trial |
| Reads lab certificates | Yes, 10 a month on Free | Clarity add-on, “Contact Us” | Not stated | Not stated | Not stated |
| Lowest paid plan | $49 a month, 250 instruments | Core: $79 a month billed annually ($99 monthly), 500 gages | Starter: $49 a month billed annually ($59 monthly), 150 instruments | Starter: $70 a month, 500 assets | $99 a month, 500 instruments |
| Source | our pricing page | gagelist.com/pricing read 6 Nov 2026 | gaugelog.com/pricing read 8 Nov 2026 | gaugify.io/pricing read 8 Nov 2026 | gagepilot.com read 8 Nov 2026 |
“Not stated” means the vendor's pricing page does not say; it may still be offered. GageList's page was read in a browser on 6 Nov 2026; the others on 8 Nov 2026. A spreadsheet is free too: it has no reminders unless someone opens it.
Start free in three steps
Step 1: Bring your spreadsheet
Upload your gage list as .xlsx, .xls or .csv. CalibrationOS suggests a field for each column and shows you what it will import before it saves anything. No list yet? Download the template from the import page.
Step 2: Name who looks after each gage
Put the custodian's email on each gage. Reminders go to them before it comes due, and to an admin for any gage still waiting for a custodian.
Step 3: Read the due list on Monday
Every Monday the due list arrives by email: what is overdue, what is due in the next 30 days and what has never been calibrated. Upload the lab's certificate when a gage comes back.
Free for 25 instruments. Unlimited users. No card.
What the paid plans add
Free covers 25 instruments with unlimited users. Starter is $49 a month for 250 instruments; Professional is $149 a month for 2,500 instruments and 3 sites. Both have a 14-day trial. Every plan has unlimited users.
See every planQuestions
Is the Free plan really free, or a trial?
Free is a plan you keep: no time limit and no card. Starter and Professional each start with a 14-day trial.
How many users can I add on Free?
As many as you need. Every plan has unlimited users.
What happens when I reach 25 instruments?
Everything you already have keeps working: records, reminders and exports. To add a 26th gage, upgrade to Starter for 250; your gages and history come with you.
Do retired gages count toward the 25?
Yes. Retiring a gage keeps its calibration history for the audit, so it still counts toward the limit.
Does the Free plan send reminders?
Yes. Each gage's custodian gets an email before it comes due, and the due list goes out every Monday. You can send yourself a test from the dashboard.
What happens to my data if I upgrade?
It stays as it is. Gages, history, certificates and the audit log carry over; nothing is re-entered.
Can I get my data out?
Yes, on every plan. Download the equipment register as CSV or PDF, or the audit package: one ZIP with the register, a calibration summary, out-of-tolerance investigations, traceability to your standards and the audit log, each as a CSV file.
Start free with your own gages
Free for 25 instruments. Unlimited users. No card. Bring your spreadsheet and leave with a due list.