A Roblox pet system with egg hatching, odds and pity, done right
A complete, tested Luau pet system: eggs with true odds, luck and pity; hatching that charges once with triple hatch, auto-delete and Robux eggs; a pet inventory with equip slots, locks and save/load; Golden and Rainbow fusing; pets that follow every player.
How do I add a pet system with egg hatching to my Roblox game?
A pet system has four parts: eggs with published odds, a hatcher that charges the player only when the hatch succeeds, an inventory that saves, and pets that follow the player. Building them takes days and most free models skip the odds and the tests. Hatchwren is all four as tested Luau modules you drop into Studio and configure in one table.
- Insert the .rbxmx (or sync the Rojo project) and keep the example server and client scripts.
- Edit the config table: eggs, prices, currency, pets and their weights; the published odds are read from the same table.
- Press Play: buy an egg, hatch, equip, fuse to Golden or Rainbow, and watch the pets follow.
Real screenshots
What a good pet system needs
Odds that match what you show players. Roblox requires experiences with paid random items to disclose the odds, so the shown odds must come from the same table the hatcher rolls.
Server-side charging that happens once, only after a hatch succeeds, so a failed or interrupted hatch never takes currency. Pity (a guaranteed rare after N dry hatches) and luck boosts that change the weights in a known way.
An inventory that saves with DataStores, equip slots and locks, and pets that follow without lagging the server.
Free model, tutorial or a kit?
Free models are a fine way to learn, but check them for hidden scripts and for odds that do not match the code. A tutorial teaches you the parts; a tested kit saves the days of edge cases (double charging, lost pets on rejoin, pity resets).
Hatchwren does not include trading yet; if trading is a must, the $17.99 to $19.99 kits above include it.
Hatchwren vs the alternatives
Published prices, each checked on the date shown; prices change, so confirm on each site.
| Product | Price | Free | Checked |
|---|---|---|---|
| Hatchwren | $12 once; $25 for all 4 Roblox kits | sampler modules + real output on the kit page | live |
| Basic Pet System with Trade (King-Games-Shop, itch.io) | $17.99 | - | 2026-10-15 |
| Cartoony UI + Pet System + Trade & Store (King-Games-Shop, itch.io) | $19.99 | - | 2026-10-15 |
| Roblox Pet System (RBLX Essentials, itch.io) | $9.99 | - | 2026-10-15 |
| Simulator Core (studmint, itch.io) | $9.99 | - | 2026-10-15 |
| Egg Hatching System (J4KDev, itch.io) | GBP 15 | - | 2026-10-15 |
Why teams pick Hatchwren
- $12 once for eggs, hatching, inventory, fusing and following, with an example UI.
- Odds you can publish honestly: 100,000 seeded hatches land on the configured weights, and the pity counter is tested.
- Charges once, after the hatch succeeds; triple hatch, auto-delete and Robux eggs included.
- Tested Luau (26 tests), delivered as .rbxmx and a Rojo project, with an API reference; 14-day fix-or-refund.
FAQ
Is there a free Roblox pet system?
Yes, many free models exist; check them for hidden scripts and honest odds. Hatchwren's kit page has free sampler modules (Formation and Signal) and real output from the shipped code.
Does Hatchwren include trading?
No, not yet. The King-Games-Shop kits at $17.99 and $19.99 include trading; Hatchwren costs less and adds tested odds, pity, fusing and Robux eggs.
Will it save players' pets?
Yes: the inventory saves and loads with DataStores. Our article on saving player data explains the pattern.
What licence do I get?
Unlimited Roblox experiences, commercial use, for you or your clients; no credit needed. No reselling or sharing the code itself.
What else is in the $25 bundle?
Stallwren (shop and currency), Gavelwick (admin commands) and Millwren (tycoon kit), all tested Luau.
Related
Free: the Roblox Starter Kit
7 free Luau modules (damage, pets, shop formatting, admin audit log, tycoon guards and more) plus 3 free calculators, then 5 short emails with the scripting fixes we see go wrong most often.