The best allergen introduction app in 2026 is Sito, the app we build. We read the App Store listings of six other baby allergen apps on October 26, 2026 and set them beside Sito.
- A good allergen app helps you start the nine common allergens one at a time, keep each one in your baby's diet, and keep a record for the doctor.
- Solid Starts, Baby Bites, SafeSpoon, WBAT, First Bites and First Bite sit in the table below, each as its own listing describes it.
- We recommend Sito, our app: its Allergen Ladder takes the nine one at a time, asks how it went after each taste, and stays open until age 2.
Nine allergens, one at a time
Add your baby, and the Allergen Ladder is there when solids begin. Free to download, with a free trial.
The 7 allergen introduction apps side by side
| App | The nine, one at a time | After each taste | Keeping it up | Serving it by age | For the doctor | After age 1 |
|---|---|---|---|---|---|---|
| Sito | 9 allergens, a small amount first | "How did it go?", one reminder at 2 hours | Blue this week, orange offer it again | 583 foods at your baby's age | One PDF, ten languages | Meals and 18 nutrients |
| Solid Starts | Introduced along the way, step by step | Reactions in the food log | Not mentioned | 400+ foods, cut and serve by age | Reactions you can download for doctors | Toddler and family recipes |
| Baby Bites | Tracks which are introduced | Reactions and notes for each bite | Last eaten, what's due next, your own rhythm | Not mentioned | Not mentioned | Not mentioned |
| SafeSpoon | All 9 on one dashboard | Reaction scale, photo, symptoms, onset | Reminders to re-introduce | Not mentioned | PDF or CSV report | Not mentioned |
| WBAT | Big 9, a 3-day run for each new one | Exposure log with notes | Weekly: what's due this week | Not mentioned | Not mentioned | Not mentioned |
| First Bites | Allergen guidance in a 500+ food tracker | Amounts and preparation | Days since each allergen | Not mentioned | Not mentioned | Not mentioned |
| First Bite | Big 9 with a "Day x/3" counter | Symptom checklist, severity, photos | Reminders to keep them in the diet | Allergen-aware recipes | Report for the pediatrician or allergist | Not mentioned |
The best allergen introduction app: Sito
Sito changes with your baby's age. From 4 to 11 months the home screen is Starting Solids, with the Allergen Ladder card on it. From 12 months the full app opens on its own, with meals from a photo and 18 nutrients, and the Ladder stays as a row until age 2.
The Ladder takes the nine allergens one at a time: egg, peanut, milk, wheat, soy, sesame, tree nuts, fish and shellfish. Each allergen's page gives a small first amount and says: "First time: at home, nothing else new that meal, and watch for two hours." If one food would bring two new allergens at once, Sito says to give each one on its own first.
After each allergen taste it asks "How did it go?": no reaction, or something happened. With notifications on, one reminder comes two hours later if you have not answered. Blue means your baby had it in the last 7 days. Orange means it is time to offer it again.
If something happened, the form opens with the emergency line and lets you save and pause that allergen. The Ladder then says to talk to your doctor before the next taste and keep introducing the others. Sito asks before adding it to your baby's allergies; that decision is for you and your doctor.
For the doctor, one PDF lists the nine allergens with the first and last taste, the number of tastes and any reactions, made on the phone in ten languages. Each of the 583 foods has a card on how to serve it at your baby's age, peanut and eggs included. Both parents log from their own phones with an invite code.
How we compared
We opened each app's own App Store listing on October 26, 2026 and filled the table from what it says. "Not mentioned" means the listing does not say; the app may still do it. Sito's row comes from the app itself.
The 7 best allergen introduction apps, ranked
For apps for all first foods, we have a separate list.
1. Sito: the nine allergens one at a time, with a check-in after each
The Allergen Ladder is why Sito comes first: one allergen at a time, a check-in after each taste and one PDF for the doctor (more above).
2. Solid Starts
A starting solids guide with 400+ foods by age. Its listing says "Common food allergens are introduced along the way, with step-by-step guidance", and reactions in the food log can be downloaded for doctors (App Store, updated October 22, 2026).
3. Baby Bites: Allergen Tracker
Its listing calls it "a simple baby allergen tracker that helps you keep allergens in your baby's diet after introduction". It shows what was last eaten and what is due next, at your own rhythm (App Store, updated October 11, 2026).
4. SafeSpoon: Allergen Tracker
Logs the date, allergen, serving size and preparation, and rates reactions from none to severe, with a photo and symptoms. It makes a PDF or CSV report (App Store, updated October 17, 2026).
5. WBAT: Baby Allergen Tracker
Guides you through a three-day run of feedings for each new allergen, then reminds you "which foods are due this week". Exposures are logged with notes (App Store, updated October 15, 2026).
6. First Bites: Baby food tracker
A food tracker with 500+ foods and allergen guidance. Its listing says it "tracks how many days have passed since each allergen was consumed" (App Store, updated September 21, 2026).
7. First Bite: Baby Food Allergy
A different app from First Bites. It counts the Big 9 with a "Day x/3" counter, records reactions with a symptom checklist, severity and photos, and makes a report for the pediatrician or allergist (App Store, updated August 15, 2026).
What to look for in a baby allergen tracker
- When to start. ASCIA says solids start "usually around 6 months of age and not before 4 months of age". The CDC says about 6 months, and before 4 months is not recommended. ASCIA puts the nine in the first year, with well cooked whole egg and smooth peanut butter ("not whole nuts or pieces") "soon after they have started solid foods". If your baby has severe eczema or an egg allergy, the AAP says "testing for peanut allergy is recommended". A 2021 consensus of US and Canadian allergy societies says "Screening before introduction is not required" (JACI In Practice). The AAP and the CDC say to ask your baby's doctor how and when to give peanut. Our guide on introducing allergens to a baby sets out where the groups differ.
- One new allergen at a time. ASCIA says to "only introduce one new food at the same meal", so the trigger food is easier to identify. The NHS says "one at a time so that you can spot any reaction". The CDC says "Wait 3 to 5 days between each new food", one AAP page says "wait at least a day", and ASCIA gives no day count. Look for an app that warns when one food carries two new allergens.
- Keep it up. Once a food is tolerated, ASCIA says "at least once a week, in age appropriate servings". The NHS says to make it "part of your baby's usual diet", and the AAP says to "keep in their diet routinely". Neither gives a number. Look for an app that shows what is due.
- The signs. The NHS says reactions usually happen "within a few minutes", but symptoms can take "up to 2 hours" to appear. For signs such as hives, swelling of the face or eyes, or vomiting, ASCIA says to stop feeding that food and seek medical advice. Difficult or noisy breathing, a swollen tongue or throat, or a young child who turns pale and floppy are signs of anaphylaxis, which ASCIA says "should always be treated as a medical emergency". The AAP calls anaphylaxis "a life-threatening emergency" and adds "trouble breathing or swallowing", "swelling of the lips or tongue" and a "pale or bluish color". At any of these, call 911 or your local emergency number. Look for an app that asks after each taste.
FAQ
What is the best app for introducing allergens to a baby?
We recommend Sito, the app we build. Its Allergen Ladder takes the nine allergens one at a time, a small amount first, and asks "How did it go?" after each taste. With notifications on, one reminder comes two hours later if you have not answered. Blue shows the ones your baby had in the last 7 days, orange the ones to offer again, and one PDF carries it all to the doctor. The Ladder stays open until age 2, in the app that shows how to serve 583 foods by age and opens meals at 12 months.
How do I keep track of which allergens my baby has had?
In Sito, the Allergen Ladder shows when your baby last had each allergen: blue for the last 7 days, orange for time to offer it again. Every taste and reaction stays in the history, and both parents log from their own phones. A rung counts the allergen food itself, not a dish that only also contains it, and a refused taste is not counted. ASCIA publishes a checklist for the same job.
How often should my baby keep eating an allergen once it is introduced?
ASCIA says at least once a week, in age appropriate servings. The NHS says to make it part of your baby's usual diet, and the AAP says to keep it in the diet routinely; neither gives a number. If your baby has severe, persistent eczema or had an immediate allergic reaction to a food, the AAP says to talk with your child's pediatrician first about how and when to introduce these foods. That plan comes before any app. Sito uses ASCIA's week: orange means it is time to offer it again.
Can an app tell me if my baby is allergic?
No. An app keeps what you saw; it cannot diagnose. The AAP says skin and blood tests are not always reliable, and an allergist is the specialist who diagnoses. After signs of a reaction, ASCIA says to stop that food, seek medical advice, and get specialist advice before trying it again. Trouble breathing or swallowing, swelling of the lips or tongue, or a pale or bluish color can be signs of anaphylaxis (AAP), and so can a young child who turns pale and floppy (ASCIA): call 911 or your local emergency number. For a child with a diagnosis, see our page on a food allergy app for kids.
Sources
- ASCIA, How to Introduce Solid Foods to Babies for Allergy Prevention (updated January 2026; read October 26, 2026)
- ASCIA, Anaphylaxis (read October 26, 2026)
- ASCIA, Checklist: Introducing Solid Foods to Babies for Food Allergy Prevention (updated April 2026; read October 26, 2026)
- NHS, Food allergies in babies and young children (reviewed 22 October 2024; read October 26, 2026)
- AAP HealthyChildren.org, Starting Solid Foods (updated June 23, 2026; read October 26, 2026)
- AAP HealthyChildren.org, When to Introduce Egg, Peanut Butter & Other Common Food Allergens to a Baby (updated June 12, 2025; read October 26, 2026)
- AAP HealthyChildren.org, Food Allergies in Children (updated October 8, 2025; read October 26, 2026)
- AAP HealthyChildren.org, Anaphylaxis (updated October 8, 2026; read October 26, 2026)
- CDC, When, What, and How to Introduce Solid Foods (April 14, 2026; read October 26, 2026)
- Fleischer DM et al., A Consensus Approach to the Primary Prevention of Food Allergy Through Nutrition (AAAAI, ACAAI and CSACI), J Allergy Clin Immunol Pract 2021 (read October 26, 2026)
- App Store listings of Solid Starts: Baby First Foods, Baby Bites: Allergen Tracker, SafeSpoon: Allergen Tracker, WBAT: Baby Allergen Tracker, First Bites: Baby food tracker and First Bite: Baby Food Allergy, read October 26, 2026