Kidneybook: CKD Lab Tracker
eGFR and creatinine, charted
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Your lab reports, as one line.
Kidneybook is a simple log for chronic kidney disease. Type in the creatinine and eGFR values you get at each appointment and years of history become clear at a glance. No sign-up. No ads. Everything stays on your device.
■ 16 lab items, all free
Creatinine, eGFR, urea nitrogen, uric acid, urine protein, urine albumin, potassium, phosphorus, sodium, calcium, albumin, hemoglobin, LDL cholesterol and more. Add your own items when your clinic measures something that isn't here, and reorder or hide the ones you don't use.
■ Work back through the folder
Start with your most recent report, then use Save and go to the previous test — the date steps back by your appointment interval. You can enter years of old reports in order, up to 20 years back.
■ The difference from last time, and nothing more
Each value shows the change from the previous test with a + or −. There is no colour-coding, no reference ranges, no "abnormal" flag, and no eGFR calculation. It is your record, not a judgement.
■ Daily weight and blood pressure, if you want them
Turn on the Daily tab to record weight and blood pressure at home, morning and evening. Leave it off if you only want lab values.
■ One page for the clinic
The last 12 tests as a single landscape table (Pro).
Free: all 16 lab items, adding and reordering items, entering past tests, and the last 90 days of the charts.
Pro (a one-time purchase, no subscription): charts over all time, the clinic PDF, CSV export, and managing other people.
Note: this app is a log for your lab results. It does not diagnose, treat, or provide medical advice; it makes no comparison against reference ranges and does not calculate eGFR. Always talk to your doctor about your values, how you feel, and your treatment.
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Thank you for using the app.
This update revisits the details so everything feels a little smoother, including parts you may never notice.
If anything catches your eye, please let us know from the contact form inside the app. Your notes are what shape the next update.
The developer, RAINBOW TREE LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- User Content
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- RAINBOW TREE LLC
- Size
- 12.9 MB
- Category
- Medical
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
Contains
Health or Wellness Topics
- In-App Purchases
Yes
- 腎臓ノート Pro $5.99
- Copyright
- © 2026 RAINBOW TREE LLC