Side by side.
| Feature | MeAgain | Shotsy | Glapp | Phaze | OptiPin | GlucoPal | Pip Body Scan |
|---|---|---|---|---|---|---|---|
| Suggests the next site | Yes, alternating left and right when you enable it | Yes | Yes, from a rotation plan you choose | Yes, a “recommended next” site | Yes, an auto-advancing site map you can customise | Not stated. Keeps a body-map history | No. Shows your last site |
| Sites | Choose a site and keep it consistent, or alternate sides | Not stated on their site | The sites you choose for your plan | Six areas, per its listing | A map you can customise | Not stated on their site | Left or right abdomen, thigh, upper arm and glute, or Other |
| Site reactions | Injection Site Reaction, rated 0 to 10, beside your dose history | Not stated on their site | Not stated on their site | Not stated on their site | Site-reaction tags with each dose | Not stated on their site | Sore, red, swollen, bruised or other, with each shot |
| Also tracks | Doses, food, protein, fibre, water, weight and symptoms | Doses, side effects, weight and titration | Doses, levels, appetite, side effects and pen or vial supply | Doses, levels, 40 side effects, food and labs | Peptides, TRT and GLP-1s, with bloodwork and inventory | Doses, meals, weight, side effects and photos | Symptoms, meals, workouts and a weekly 3D body scan |
| Medicines | GLP-1s, shots and pills | GLP-1s | GLP-1s, including compounded | GLP-1s, shots and pills | Peptides, hormones and GLP-1s | GLP-1s, including compounded | GLP-1s and tesamorelin built in. Type any other name |
| Phones | iPhone and Android | iPhone and Android | iPhone, Android and the web | iPhone, Apple Watch and Android | iPhone. Android not stated on their site | iPhone and Android | iPhone only (iOS 17 or later) |
| Free to use | Shot logging, alternating sites and symptom scores are free | Core tracking is free | Core tools free | Free for your first medicine, site rotation included | Free for your first compound | Free. GlucoPal Pro is optional | No free tier or trial. Your first scan is free to take; join to see your results |
| US App Store rating | 4.8 (38,848) | 4.8 (33,987) | 4.8 (1,026) | 4.6 (43) | 4.8 (176) | 4.8 (3,322) | Not on the App Store yet |
“Not stated” means we couldn’t find it on that app’s website or App Store listing. The six other apps are free to download on the US App Store. Pip Body Scan is coming soon to the App Store, for iPhone, and needs a membership to see your results.
How we ranked
We put the apps that suggest your next site first, then ordered them by whether that feature is free, whether there’s an Android app and how many US ratings each has. MeAgain leads under that rule, using the dated rating records below; rating counts do not test the quality of a rotation suggestion. GlucoPal and Pip Body Scan keep a record of your sites but, as far as their own sites say, don’t suggest the next one, so they come last.
A suggestion is only a record of your pattern
An app’s suggestion follows the pattern you set or the sites you’ve used. It doesn’t know your skin, your medicine’s leaflet or what your nurse told you. Where to inject, and how to rotate, is for your prescriber, nurse or pharmacist to advise. These apps keep track of what you chose.
If you only want a printable chart, Pip’s free injection site rotation planner on this website lays out a weekly map from the Mounjaro, Wegovy, Zepbound and Ozempic leaflets. It doesn’t store anything.
What Pip Body Scan does with sites
Pip Body Scan records the site you pick on a front and back body map, shows your last site, and logs any reaction: sore, red, swollen, bruised or other. It doesn’t suggest the next site. Its main job is a weekly 3D body scan, so choose it if you want that as well.
Which one fits you?
- MeAgain
- You want free alternating-side suggestions and a 0-to-10 site-reaction log beside your meals and dose history.
- Shotsy
- You want free next-site suggestions on iPhone or Android, with the rest of your GLP-1 log alongside.
- Glapp
- You want to set your own rotation plan, with pen or vial supply tracked dose by dose.
- Phaze
- You want a recommended next site with a prep checklist, plus detailed side effects and an Apple Watch app.
- OptiPin
- You run several compounds, such as peptides or TRT, and want a customisable site map on your iPhone.
- GlucoPal
- You want a free history of where each dose went, with no account.
- Pip Body Scan
- You want to note site reactions next to each shot and see your body change in 3D each week.
Questions people ask.
Which injection site tracker is free?
MeAgain, Shotsy, Glapp and Phaze include site rotation in their free versions, OptiPin is free for your first compound, and GlucoPal is free. Pip Body Scan needs a membership.
Can I log injection site reactions?
MeAgain has an Injection Site Reaction symptom scored from 0 to 10. OptiPin advertises site-reaction tags with each dose. Pip Body Scan records sore, red, swollen, bruised or other with each shot. We did not find a dedicated reaction field for the other four, though Phaze allows dose notes. Regimen also lists site reactions among its daily markers.
Where these facts come from.
Rival websites and App Store listings read on 26 October 2026. Ratings are from the US App Store, using Apple’s public lookup, on the date shown for each app. Features are what the developers advertise, not results from hands-on testing or an independent security or clinical assessment. Free and paid access can change; check the app before choosing.
- Pip Body Scan Pip Body Scan facts sheet, checked against the current iPhone build on 25 October 2026. How Pip estimates work
- MeAgain meagain.com home page and free-tracker page; App Store listing. Website · App Store · Free download. Rating checked 25 October 2026.
- Shotsy shotsyapp.com home page and free-tracker page; App Store listing. Website · App Store · Free download. Rating checked 25 October 2026.
- Glapp glapp.io home page and FAQ; App Store listing and its latest release notes. Website · App Store · Free download. Rating checked 26 October 2026.
- Phaze phaze.fit home page, pricing table and FAQ, plus its injection tracker, body tracking and body composition pages; App Store listing. Website · App Store · Free download. Rating checked 26 October 2026.
- OptiPin optipin.app home page; App Store listing. Website · App Store · Free download. Rating checked 26 October 2026.
- GlucoPal glucopal.com home page and FAQ; App Store listing (“Zepbound & Mounjaro Tracker” in the US, “Mounjaro Tracker” in the UK). Website · App Store · Free download. Rating checked 26 October 2026.
- Regimen helloregimen.com home page; App Store listing. Website · App Store · Free download. Rating checked 26 October 2026.
- MeAgain: free GLP-1 tracker. The free shot log includes alternating-side suggestions, with the same free features on Android; the symptom log includes 29 presets and custom entries scored from 0 to 10. Read it. Checked 26 October 2026.
- MeAgain: injection-site tracking. Describes left-right alternation and the Injection Site Reaction symptom. Read through the search index; direct extraction was unavailable during this check. Read it. Checked 26 October 2026.
- OptiPin feature guide. Lists automatic next-site rotation and site-reaction tags for individual doses. These are developer-described features, not medically assessed recommendations. Read it. Checked 26 October 2026.
Pip Body Scan is a personal progress-record tool. It does not provide medical advice, diagnose conditions or recommend treatment or doses. Body-fat and waist figures are AI estimates, not medical measurements. Speak to a qualified healthcare professional about medical concerns or changes to a treatment plan. Other app names are trademarks of their owners and are used here only to compare.