Cool.Development #690388310
Cool.Development is a Roblox group community with 191,407 members. It was created on April 21, 2026. The group holds a verified badge and is not ownerless. Its category is listed as null.
Membership history
Growth
| Measured (UTC) | Members | Change |
|---|---|---|
| 22 Oct 2026, 20:07 | 188,894 | -5 |
| 22 Oct 2026, 18:40 | 188,899 | -1 |
| 22 Oct 2026, 18:17 | 188,900 | -1 |
| 22 Oct 2026, 17:05 | 188,901 | -1 |
| 22 Oct 2026, 16:17 | 188,902 | -1 |
| 22 Oct 2026, 16:09 | 188,903 | -2 |
| 22 Oct 2026, 15:20 | 188,905 | -1 |
| 22 Oct 2026, 15:04 | 188,906 | -1 |
| 22 Oct 2026, 14:31 | 188,907 | -2 |
| 22 Oct 2026, 14:23 | 188,909 | -2 |
| 22 Oct 2026, 14:13 | 188,911 | -2 |
| 22 Oct 2026, 13:12 | 188,913 | -1 |
| 22 Oct 2026, 12:51 | 188,914 | -1 |
| 22 Oct 2026, 12:43 | 188,915 | -2 |
| 22 Oct 2026, 11:30 | 188,917 | -1 |
| 22 Oct 2026, 09:54 | 188,918 | -3 |
| 22 Oct 2026, 09:31 | 188,921 | -1 |
| 22 Oct 2026, 09:25 | 188,922 | -1 |
| 22 Oct 2026, 08:49 | 188,923 | -1 |
| 22 Oct 2026, 08:15 | 188,924 | first reading |
Ownership
Owned by Sinial (@Persinial) as measured.
Claimed by user #5776464666 — observed between sweeps, detected 10 Aug 2026, 13:55 UTC
Detection dates bound when a change was seen by this register, not when it happened.
Groups seen changing owner — the largest ever handed over and the most recent — are on the ownership transfers board.
Experiences
Experiences this group owns, by lifetime visits. Live-player counts are from our last measurement.
Members we’ve seen
Sinial (@Persinial) — Owner (rank 255)
Cool_name (@parkjh0917) — CoolName (rank 254)
@piecefirem — Product Manager (rank 200)
@gamdol7 — Product Manager (rank 200)
@joon111221 — Product Manager (rank 200)
@Artennix — Member (rank 1)
MathMagic (@MathMagic10) — Member (rank 1)
Gongback (@Dev0back) — Member (rank 1)
PlingPlongPleo (@TheoIsTheProYo) — Member (rank 1)
MasterOfBacon (@MasterOfStocks) — Member (rank 1)
@xxrunbro — Member (rank 1)
StarCodeItzVexo (@ItzVexo_STARCODE) — Member (rank 1)
@ImZiber — Member (rank 1)
@Olicai — Member (rank 1)
Kiz (@Kizerath) — Member (rank 1)
@Robsicals — Member (rank 1)
TheRealZelly (@TheRealZellyDev) — Member (rank 1)
amcapadu67 (@zaty_31) — Member (rank 1)
DOG (@LivingInAParanoid) — Member (rank 1)
@racerxe — Member (rank 1)
Voi (@2arget) — Member (rank 1)
Quintin (@Quamocl) — Member (rank 1)
AwesomeSauce (@0_AwesomeSauce) — Member (rank 1)
RuinYz (@dallas2pointO) — Member (rank 1)
ImBOB (@B0B_Gameur) — Member (rank 1)
A sample — only members this register has independently measured, highest rank first. Not the full roster.
Rank structure
Roles and per-rank member counts as Roblox reports them (rank 0 = guest … 255 = owner).
Related groups
Groups whose measured members overlap with this one — a sample from our membership graph.
Open data
Download this group’s measured record — free to reuse with attribution: membership history (CSV) · full record (JSON)
Each file carries its licence and retrieval time inside it, and is generated from the same measurements shown above.