BubbleGradeTerms of use and licence
Last updated: 14 November 2026
1. Who we are
BubbleGrade is made by VishwaStack, an individual trading as VishwaStack in India (“we”). Paid licences are sold through our payment partner, which acts as the merchant of record for the transaction.
2. Licence
- Free version: every feature, personal or commercial use, up to 30 answer sheets per grading batch, with a “BubbleGrade Free” line on exported results.
- Pro yearly: one institute or teacher, unlimited sheets, no watermark, valid for one year from purchase (the app returns to the free limits when it expires; your files and results are untouched).
- Pro lifetime: the same, without an expiry date, with updates for all 1.x versions.
- Pro may be installed on the computers used by your own institute's staff.
- Answer sheets you design with BubbleGrade may be printed and photocopied without limit.
- You may not resell, share or publish licence keys, or reverse-engineer the licensing mechanism.
3. Your responsibilities
Optical mark reading is never perfect. Poor photos, faint or partial marks, ticks, crosses, folds and damaged sheets can be misread. BubbleGrade flags sheets and questions it is unsure about, but it can still make mistakes it does not flag. Our published accuracy figures come from synthetic test sheets, not from your sheets. You are responsible for checking results (at least every flagged sheet, plus a sample of the others) before publishing marks or using them for any decision about a student. BubbleGrade only reads sheets designed in BubbleGrade.
4. No warranty
The software is provided “as is”, without warranty of any kind, including fitness for a particular purpose.
5. Limitation of liability
To the maximum extent permitted by law, our total liability for any claim relating to the software is limited to the amount you paid for your licence. We are not liable for indirect or consequential losses.
6. Refunds
If the software does not work for you, email us within 7 days of purchase for a full refund.
7. Governing law
These terms are governed by the laws of India. Courts in Chennai, Tamil Nadu have jurisdiction.