PepCue vs PeptideKit.
We could not verify PeptideKit's current feature set or pricing from public information, so there is no checkmark table here pretending otherwise. Instead this page focuses on the part of a peptide app that is easiest to check and hardest to fake: the arithmetic. Reconstitution math is where mistakes actually hurt people, and it is the one feature you can test for yourself in thirty seconds without installing anything.
Last checked September 2026. Competitor features and pricing change, so verify on their own site or App Store listing before you decide.
You want the vial math free in a browser with no account, and you want the compound you are about to reconstitute graded on a published evidence model rather than described in marketing copy.
You already use PeptideKit and it works for you. Familiarity and an existing history are worth real money, and no comparison page should talk you out of a tool that is already doing its job.
We have not verified PeptideKit's features, pricing, ratings or review counts, so their column is blank throughout. Check their own listing before drawing conclusions from this page.
Side by side, verifiable rows only.
| PepCue | PeptideKit | |
|---|---|---|
| Price | Free to use. You can run a full protocol without paying, and there is no subscription gate on logging, schedules, the calculators or the evidence library. | Not verified. Check the App Store listing for current pricing. |
| Account required | Not required. Tracking starts without an account, and the browser calculators need no sign-up either. | Not verified |
| Reconstitution calculator | 9, free in the browser with no account and no install: reconstitution, blends, GLP-1 titration, pen clicks, vial longevity, unit conversions and BAC water. | Not verified |
| Blend and multi-compound math | A blend calculator handles per-component concentration for multi-compound preparations, on numbers you enter. It recommends nothing. | Not verified |
| Unit conversion | Micrograms to milligrams, milligrams to IU, pen clicks to units, plus a bacteriostatic water helper. | Not verified |
| Evidence grading | Every compound carries an S to F evidence tier scored on six axes: human evidence, preclinical depth, mechanism confidence, safety clarity, regulatory clarity and practical relevance. | Not verified |
| Scoring model published | Yes. The full six-axis model, the tier thresholds and a worked example on a real compound are published on the methodology page. | Not verified |
| Citations | 306 cited sources across 69 compound profiles, plus a generated research index of 274 unique PubMed records, every one pulled from NCBI and re-resolved against live PubMed by an audit script kept in the repo. | Not verified |
| Compound library | 69 compound profiles covering regulatory status, mechanism, what the published evidence actually shows, and safety. | Not verified |
| Affiliate codes or vendor rankings | None. PepCue sells no peptides, ranks no vendors, takes no kickbacks and places no affiliate codes. | Not verified |
| Dosing guidance | Never. PepCue explains compounds and does the arithmetic on numbers you enter. It does not tell anyone what to take. | Not verified |
| Where your data lives | Protocols, doses, inventory, weights and check-ins are stored on your device rather than on our servers. | Not verified |
What PepCue does differently.
Start with the math, because it is the part of this category with real consequences. A vial arrives as a lyophilised powder measured in milligrams. You add bacteriostatic water measured in millilitres. You then need to draw a dose expressed in micrograms, read off a syringe marked in units. Three different scales, two unit systems, and a decimal point that moves. A mistake here is not a slightly suboptimal outcome, it is an order of magnitude.
PepCue puts 9 calculators on the open web, free, with no account and no install: reconstitution, blends, vial longevity, GLP-1 titration, pen clicks, micrograms to milligrams, milligrams to IU and a bacteriostatic water helper. You can check any of them against your own arithmetic before you trust the app with anything else. They compute on what you enter and they never suggest a number, because suggesting a number would be dosing advice and PepCue does not give dosing advice.
Around the math sits the library, which is the reason the site exists. Every compound carries an S to F evidence tier computed from six scored axes rather than assigned by opinion: human evidence, preclinical depth, mechanism confidence, safety clarity, regulatory clarity and practical relevance. The model is published with its thresholds and a worked example, so a grade is auditable. Across 69 profiles there are 306 cited sources, and a generated research index holds 274 unique PubMed records re-resolved against NCBI by an audit script kept in the repo.
The last difference is commercial. PepCue sells no peptides, ranks no vendors, takes no kickbacks and places no affiliate codes. That is not a moral flourish, it is the reason the grades can stay honest: there is no supplier whose product a bad grade would cost money. It is also why several of the most searched compounds on the site grade poorly and the pages say so plainly.
Where PeptideKit is stronger.
We cannot name a specific strength for PeptideKit, and inventing one to look balanced would be its own kind of dishonesty. What we can say is that an app we have not verified may well do things PepCue does not, and this page is not evidence that it does not.
The general case for staying put also applies. Your existing history has value, migration is tedious, and the app you have already built a habit around is the one you will keep using. If PeptideKit is that app for you, the sensible move is to keep it and use PepCue's free calculators and library alongside it, since neither needs an account.
If you do try both, compare them on the arithmetic first. Run the same reconstitution through each and check the result by hand. That is a test you can actually perform, unlike a feature-count comparison, and it tells you something that matters.
FAQ.
Which app has the better reconstitution calculator?
Test it rather than take our word for it. PepCue's calculators are free in the browser with no account, so you can run the same vial size, water volume and target dose through both and check the answer against your own arithmetic. That is a thirty-second test and it is more reliable than any comparison page.
Why does this page not list PeptideKit's features?
Because we could not verify them. A site that grades evidence on a published model cannot print an unverified feature list for a competitor and keep a straight face. Blank cells mean unverified, not absent.
Does PepCue tell me what dose to use?
No, never. The calculators do arithmetic on numbers you enter and the compound pages explain what has been studied. What to take, and whether to take anything at all, is a conversation for you and a licensed provider.
Is the PepCue library free?
Yes. All 69 compound profiles, the tier board, the methodology page and the calculators are free on the web with no account and no install.
Last checked September 2026. Competitor features and pricing change, so verify on their own site or App Store listing before you decide.