Press release · Piru
kageroumado Releases Piru, an Open-Source Dose Journal and Offline Pharmacology Library for iPhone, Android and Mac
Piru is a private dose journal, trip notebook and offline pharmacology library with pharmacokinetic timelines and interaction references. Available for Mac, as an iPhone beta on TestFlight and as an Android alpha. Free and open source under GPL-3.0.
Published · Updated . Features and availability describe the product at the update date.
On September 26, 2026, kageroumado released Piru 1.0 for Mac, followed on September 29, 2026 by the first Android alpha. Piru for iPhone is available as a public beta through Apple's TestFlight. Piru is a free, open-source dose journal, session notebook and offline pharmacology library for people who want an accurate record of what they took, when, and how it affected them.
Users log each dose with its amount and time, keep medication strengths, routines and reminders beside the day's timeline, and see pharmacokinetic curves estimating how each dose changes over time. Session notes carry their own timestamps together with mood, intensity and effects, and can be exported as a written report. With permission, Apple Health adds heart rate and blood pressure to the timeline.
The built-in pharmacology library works entirely offline and covers more than 1,100 substances, from common prescription medications to less familiar compounds. Each entry shows the sources behind its individual fields, and users can compare references and set their priority when sources disagree. Tools include interaction references, half-life estimates, a medication calendar, supply tracking and an effect estimator.
The journal is stored on the device. Piru has no account, advertising or analytics, and encrypted backups are optional. The app and its library are available in English, Simplified Chinese and Traditional Chinese. Piru provides estimates for personal record-keeping and is not medical advice.
Key features
- Dose journal with pharmacokinetic timelines, routines and reminders
- Timestamped session notes with mood, intensity and effects
- Offline library of 1,100+ substances with per-field sources
- Interaction references, half-life estimates and supply tracking
- On-device storage, no account, optional encrypted backups
- English, Simplified Chinese and Traditional Chinese
How it compares
| App | Price | License | Concentration curves | Platforms |
|---|---|---|---|---|
| Piru | Free | GPL-3.0 | Estimated concentration curve for each dose | macOS 26+; iOS 26+ (TestFlight beta); Android 9+ (alpha) |
| PsychonautWiki Journal | Free; Premium US$2.99, $19.99 or $69.99 lifetime | Proprietary; GPL-3.0 repository archived | Insights on consumption patterns | iOS 17.6+; Mac with M1+ (macOS 14.6+); Android |
| PsyLog Journal | Free; no in-app purchases | GPL-3.0 | Intake patterns and statistics | Android (Google Play, APK); iOS via TestFlight and AltStore PAL |
| Shotsy | Free; premium US$9.99–14.99/month or $39.99–59.99/year | Proprietary | Estimated levels for GLP-1 medications (semaglutide, tirzepatide and others) | iOS 18+; Mac with M1+ (macOS 15+); Android |
| Medications in Apple Health | Built into the Health app | Proprietary | Taken and skipped history; PDF export | iPhone, iPad, Apple Watch |
Availability
Piru for Mac is available as a free download from GitHub. Piru for iPhone is available as a free beta through TestFlight and requires iOS 26 or later; Piru for Android is available as a free APK and requires Android 9 or later. The source code is published under the GNU General Public License v3.0. More information is available at kagerou.glass/piru.
About kageroumado
I'm Mado Kagerou, publishing as kageroumado: an independent researcher and expert Swift engineer with more than ten years of software development experience. As a founder and technical lead, I take projects from architecture through release. My research interests center on computational pharmacology, computational neuroscience and AI safety. My engineering specialties include Apple platform internals, reverse engineering, GPU rendering and local model training.
Research, engineering work and leadership experience
Media contact
kageroumado · [email protected] · kagerou.glass