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Number of apps meeting each app criterion (N=38).
| Criterion | Number of apps meeting the criterion, n (%) |
| 1. Created with headache expertise | 7 (18) |
| 2. Formal psychometric and feasibility testing | 0 (0) |
| 3. Clinically relevant headache variables measured | 7 (18) |
| 4. Usable | 24 (63) |
| 5. Customizable answer options and reports | 9 (24) |
| 6. Reports linking multiple variables | 22 (58) |
| 7. Export headache data from app | 25 (66) |
