GradeOrbit vs Olex.AI
An annual trust subscription against per-teacher seats.
Information about Olex.AI checked 19 October 2026
In short
Olex publishes a detailed English accuracy study and sells unlimited marking on an annual subscription, but not its prices. GradeOrbit publishes a per-teacher price, marks any subject, and has a free school trial.
About Olex.AI
Olex.AI is a UK AI marking tool for English, History, Geography, Maths and Science from KS1 to KS5, sold to schools and trusts on an annual subscription. It says it marks handwritten or digital work with no special paper.
What one script costs
One student’s script at four lengths, from a short quiz to a long mock booklet.
Olex.AI does not publish enough to work out a price per script.
GradeOrbit
Individual plans from £5 to £25 a month, for 30 to 180 credits. 1 credit marks one student’s script, whatever its length. Schools pay £10 per teacher a month, billed annually, with unlimited marking and AI detection on every seat.
1 credit per script costs 13.9p–16.7p on a monthly plan used in full, or 20p if you go over your allowance. School seats have no per-script charge.
Olex.AI
An annual subscription with unlimited marking and no per-script fees. Olex does not publish its prices; a third-party listing quotes from £5 a pupil.
Without published prices we cannot work out a price per script.
Published accuracy
Studies differ in subject, exam board, sample size and who ran them, so read the figures side by side rather than as a ranking.
GradeOrbit
- GCSE Maths (Pearson Edexcel): 96% of marks within 1 mark of the senior examiner, agreement score (QWK) 0.92, across 69 marks.
- GCSE English (Eduqas): 83% of marks within 1 mark of the senior examiner, agreement score (QWK) 0.96, across 98 marks.
Measured 18 October 2026 on exam board exemplar scripts. We ran the study ourselves; the method and limits are on our accuracy page.
Olex.AI
Olex publishes a GCSE English study of 157 scripts scored against standardised seed marks. Within 12.5% of the seed mark, it reports 91% (Literature) and 93% (Language), against 57% and 68% for experienced examiners on the 98 scripts both marked. It does not say who ran the study or when.
Side by side
| GradeOrbit | Olex.AI | |
|---|---|---|
| How you pay | Yes: Per script: 1 credit, any length | Yes: Annual subscription, unlimited marking |
| Pages per script | Yes: Up to 50 on individual accounts; no limit for schools | Not found: Not mentioned on its homepage or pricing page |
| Subjects | Yes: Any subject, KS3 to A-level and BTEC | Partly: English, History, Geography, Maths and Science, KS1 to KS5 |
| Handwritten scripts | Yes: Scanned or photographed whole scripts | Yes: Photos or bulk scans, no special paper |
| Mark schemes | Yes: Ready-made GCSE mark schemes, or your own criteria | Partly: Says GCSE mark scheme aligned; no boards named |
| Published accuracy figures | Yes: Against senior examiners, GCSE Maths and GCSE English | Yes: GCSE English study against seed marks |
| AI detection | Yes: 1 credit a check on individual plans; unlimited for schools | Not found: Not mentioned on its homepage or pricing page |
| MIS sync | Yes: Wonde, on school accounts | Not found: Not mentioned on its homepage or pricing page |
| Student data | Yes: Individual accounts: work not kept, names redacted in your browser. Schools: kept under a DPA | Yes: Says UK GDPR compliant, never used to train global models |
| Free trial | Yes: 10 free credits for teachers; 30-day trial for schools | Not found: Not mentioned on its homepage or pricing page |
Where Olex.AI is strong
- Publishes an English study comparing it with experienced examiners.
- Unlimited marking on an annual subscription.
- Covers primary as well as secondary.
Where GradeOrbit is different
- GradeOrbit publishes its price: one flat rate per teacher seat.
- GradeOrbit marks any subject, against your own criteria if you want.
- GradeOrbit’s school trial is free, with no card needed.
Which should you choose?
- Olex.AI may suit you if
- You mainly want English marked, across primary and secondary, under one trust contract.
- GradeOrbit may suit you if
- You want a published per-teacher price, any subject marked, and a free trial first.
Sources
- Olex.AI homepage (checked 19 October 2026)
- Olex.AI accuracy (checked 19 October 2026)
- Olex.AI on EdTech Impact (checked 18 October 2026)
Everything about Olex.AI on this page comes from its own public pages on the date shown, and may have changed since. We have not used Olex.AI’s product. Olex.AI is a trademark of its owner and is named here only to compare. Spotted something out of date? Tell us and we will correct it.
Try it on your own scripts.
Start a 30-day free trial for your school. No card needed.