Contrigraph vs SessionTap
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Contrigraph
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Grow your grass. That's the whole app. "Contrigraph" is short for contribution graph β the GitHub habit of watching squares turn green as you show up. This app takes that feeling and points it at exactly one habit. β One habit, on purpose This isn't a multi-habit dashboard. Running, reading, lifting β pick one and track only that. Fewer things to manage is why it sticks. β A year-long strip to read your rhythm The band across the top isn't for reading any single day β it's texture. Glance at it and you can tell when you were on a roll and when things slipped, all year at once. Tap it to jump to that month. β A month calendar to look back and fix things The calendar is where the real reading (and rewriting) happens. Tap any day, past or present, and cycle its effort. Five honest levels β not counted, not measured: none, a little, okay, solid, perfect. β One big button for today No hunting through a grid. Today gets its own button. β A nudge only when you'd actually forget Notifications fire only on days you haven't logged yet, and you can log right from the notification. If a streak is alive, a second "before it breaks" reminder follows later in the day. γ»Fully localized in English and Japanese γ»Dark mode and Dynamic Type support γ»Free, with a banner ad No motivation speech required. Just tap today's square.
SessionTap
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Mark what happens. Review what matters. SessionTap turns your iPhone into a live observation tool. Tap colored buttons to record timestamped events while your eyes stay on the subject. WHO IT'S FOR ABA therapists and RBTs collecting behavioral data. Sports coaches tracking plays, shots, and fouls. UX researchers logging hesitations, errors, and task completions. Classroom teachers recording engagement and participation. Anyone replacing paper tallies with something better. REUSABLE BOARDS Create a board with the event buttons you need, or start from five built-in templates: ABA Basics, Sports Scouting, UX Research, Classroom Assessment, and Simple Counter. Set up once, reuse for every session. TWO EVENT MODES Frequency: tap to count. Each tap is timestamped. Duration: tap to start, tap to stop. Track how long behaviors last. Run multiple durations at the same time. TIMERS THAT SURVIVE INTERRUPTIONS Lock your phone, take a call, switch apps. Your session keeps running. Duration timers stay accurate. SessionTap uses absolute timestamps instead of in-memory timers, so nothing resets when the screen turns off. This is a known problem with other observation tools. We solved it. REVIEW AND EXPORT See total counts, rates per minute, and duration percentages after each session. Filter the timeline by event type. Add notes for context. Export as CSV for spreadsheets, clinical documentation, or team sharing. SIMPLE PRICING $6.99, once. Not a subscription. Other observation apps charge $28/month or $80 for a permanent license. SessionTap costs less than a single month of alternatives and lasts forever. Start with 3 free sessions. Full functionality, no restrictions. See if it fits your workflow before you buy. PRIVATE BY DESIGN All data stays on your iPhone. No accounts, no cloud, no tracking. Your observation data never leaves the device unless you export it yourself.
Screenshots
Verdict
The clearest difference is in-app purchases: SessionTap at none against Contrigraph's 1. Contrigraph's advantage is update cadence (every 6 days vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Contrigraph sells 1 one-off in-app purchase. SessionTap asks for nothing beyond the download.
Contrigraph ships an update every 6 days, SessionTap every 3 months. The most recent releases landed on September 19, 2026 and September 21, 2026 respectively.
| Parameter | Contrigraph | SessionTap |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 days β better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No β better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.5 | 17.0 β better |
| Further details β not scored | ||
| Size | 10 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Hajime Nakamura | 9592 Solutions UG |
In-app purchases
Contrigraph
- Remove Ads$1.99
SessionTap
No in-app purchases
Questions
Is Contrigraph free?
Is SessionTap free?
Do Contrigraph or SessionTap have ads?
Which is updated more often, Contrigraph or SessionTap?
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