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 |
|---|---|---|
| 4 Sept 2026, 02:31 | 190,718 | -1 |
| 4 Sept 2026, 01:09 | 190,719 | -1 |
| 4 Sept 2026, 01:08 | 190,720 | -1 |
| 4 Sept 2026, 00:47 | 190,721 | -1 |
| 4 Sept 2026, 00:42 | 190,722 | -1 |
| 4 Sept 2026, 00:22 | 190,723 | -1 |
| 3 Sept 2026, 23:51 | 190,724 | -1 |
| 3 Sept 2026, 23:32 | 190,725 | -1 |
| 3 Sept 2026, 22:54 | 190,726 | +1 |
| 3 Sept 2026, 22:00 | 190,725 | +1 |
| 3 Sept 2026, 21:48 | 190,724 | -1 |
| 3 Sept 2026, 20:10 | 190,725 | +1 |
| 3 Sept 2026, 19:38 | 190,724 | -2 |
| 3 Sept 2026, 19:07 | 190,726 | -1 |
| 3 Sept 2026, 18:41 | 190,727 | -3 |
| 3 Sept 2026, 18:10 | 190,730 | -1 |
| 3 Sept 2026, 17:43 | 190,731 | -1 |
| 3 Sept 2026, 16:41 | 190,732 | -1 |
| 3 Sept 2026, 16:00 | 190,733 | +1 |
| 3 Sept 2026, 15:32 | 190,732 | 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.
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)
@joon111221 — Product Manager (rank 200)
@gamdol7 — Product Manager (rank 200)
Sethiethecuteboy (@Sethunder1rblx) — Member (rank 1)
@Zatesen — Member (rank 1)
GalacticWarrior (@Gaugeavlgameing) — Member (rank 1)
@EverettCoolman1 — Member (rank 1)
B1nary_System (@notinfbenme_jabaryo) — Member (rank 1)
LuckyFalcon (@FrejFalk) — Member (rank 1)
@holyavatar683 — Member (rank 1)
Qildd (@Qildds) — Member (rank 1)
@ttewrrr — Member (rank 1)
00テムの社長 (@sanzu_0423) — Member (rank 1)
frogo1789 (@Not_JDK) — Member (rank 1)
MattZhere (@mattZhere) — Member (rank 1)
Ooo (@ergvrvvc) — Member (rank 1)
Loop (@SUMIN00998) — Member (rank 1)
falIen (@Maola23) — Member (rank 1)
G0y0sudeh (@Starcode_OOFzilla) — Member (rank 1)
vin (@lnjzct) — Member (rank 1)
brixol (@wukertus3) — Member (rank 1)
@9tails327 — Member (rank 1)
Imyeon (@afullwol) — 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.